for me it's old school ecchi comedy like sora no otoshimono or kore wa zombie desu ka

It depends upon what you want exactly in addition to the Ecchi/fan service.

Comedy focused:

• Mm! - While this doesn’t have nudity it has plenty of fan service, but is probably the most funny ecchi shows I have seen.

• High School DxD - I’m not sure if this fits better in comedy, action or story, but it’s great since all three elements tie into one another.

• Hensuki - Great show, a lot of people won’t like the ending, but I think the ending is fantastic and offers a good rationale on behalf of both individuals involved.

• Why the hell are you here teacher? - This is my favorite Ecchi show. Unfortunately, it’s short with each episode being ~12 minutes long. But it’s fantastic in both humor and aesthetics, if you catch my drift.

In the above category you have some of my favorite comedy Ecchi shows, Mm! is the most funny, I found myself laughing several times per episode, perhaps excluding the first as it is mostly for setup.

Romance

• Monster Musume - Even if monster girls aren’t your thing, as they aren’t mine, this show is great. The ladies have their own personalities which are unique and varied as well as their physical differences. The Main Character is also a genuinely good guy, not a scum bag nor is he a dope.

• My Girlfriend is Schobitch - The premise is unique in that the female MC is trying to be the best girlfriend she can to the male MC. This results in situations arising that wouldn’t normally occur because she’s trying to cater to his desires. It is also quite comical.

• To Love Ru - While also a comedy this is also the longest series I can recommend within the Ecchi genre. The show has 4 seasons in total, and spans over a decade, so the first season looks fairly dated compared to today’s standards, but increases in each season - if you want a comparison look up To Love Ru and then compare it with To Love Ru Darkness 2 (which is the 4th season.)

A lot of Ecchi are romance to some degree as I find the best Ecchi shows are also comedies. Even all of the shows in the comedy category focus on relationships to some degree, but these aren’t quite as funny as those, yet are focused on romance.

Action

• Azur Lane - This one looks great, and has some very unique tales on action with historical battleships.

• Valkyrie Drive Mermaid - I like the power system. Essentially the women have a virus, each is usually an Extar or Liberator. The Liberator arouses her Extar partner, and the Extar then turns into a weapon for the Liberator to use in combat. This is also 100% women, so if you’re into girl on girl with combat, you can’t go wrong.

• Freezing (and Freezing Vibrations) - I thoroughly enjoy this show, it feels more adult compared to the other two IMO due to the addition of more visual blood than the others and you get a sense of more serious injuries incurred during the fights.

Other shows have good action as well, such as High School DxD.

I know I left out some popular shows in these categories such as Prison School, but it wasn’t one of my favorites compared to these, that doesn’t mean it was bad, just not as funny to me.

Now, I will list some that I expected to like, but didn’t care for:

• Queens Blade, that show was painful to go through, the combat was very short when it occurred and there was almost no humor so it really was not enjoyable IMO.

• Testament of Sister New Devil, the only other show (alongside Queens Blade) that I struggled to get through. Why? The action was fine and all, but the over use and forced use of “Brother and Sister” being used between two non-siblings made it much more incest oriented than it had any reason to be. The MCs aren’t siblings, aren’t step siblings, aren’t adopted siblings, etc. yet they refer to each other as Big Brother and Little Sister nearly every episode - several times while being basically soft core porn at some points.

• High School of the Dead, I want to add a special mention for this show. Not that it was bad by any means, but it had the single most annoying character in it from any of the Ecchi shows I own (and I own over 30 series on blu ray) that made me dread any scene she was in. The damn nurse, I know, a lot of folks probably hate me, but she was the token ditzy blonde bombshell, yet is also the school nurse and somehow dating the 4th best sniper in the world. She serves no purpose other than being the only adult shown in any state of undress so they could toss some nipples in the show. If she wasn’t in it, this show would be much higher, if you like that trope, go for it, but I loathed that lady. To give you an idea of what I mean, she’s a school nurse, can’t be that dumb, right? Time is short, she’s handed a cell phone with limited battery - she takes the time to count out the buttons to make sure they’re all there… She literally points to the first 4 or 5 and counts them 1 - 2 - 3 - 4, etc.

I hope this helped.

I'm surprised no one mentioned {Prison School} as of yet.

Its one of the funniest shows I've ever watched, with genuine laugh out aloud moments, with tons of ecchi things. My only complain about the show is there isn't more seasons.

High school dxd is honestly one of the funniest shows I’ve ever seen.

Kill La Kill

Highschool DxD

Comparto. Más allá del ecchi es genuinamente entretenido.

Edit: y tiene altos opening y outro

El primero que comento sabe cositas, en mis tiempos de full Pajín y mirar full anime ecchi la verdad es que me quedo con to love ru o high school dxd.

Mahou Shoujo ni Akogarete

Es lo mas border que hay. Un poco mas de detalle y clasificaria como Hentai

Sora no Otoshimono y KissxSis,

El gif mas tranqui de KissxSis.

Saber marionette J

https://preview.redd.it/kkshn31sns3f1.jpeg?width=465&format=pjpg&auto=webp&s=0a6ab261bba58799e05cb50e4a27fcea49384738

Igual casi que es soft hentai ya

Most of the recommendations you've gotten here aren't very well graded. As /u/RascalNikov1 mentions, there's a very large spectrum of ecchi.

It starts at: underwear flashes + boob jiggles

It ends at: basically animated soft pornography, with sexual acts that are normally only found in porn films.

If My Dress-up Darling is your first experience of this, it is also in the more "nudge nudge wink wink" sort of category than the "clothes ripped off the characters" category or the more extreme "feel free to masturbate to this" sort of category.

Unfortunately, there's not really any good classification for ecchi to help you know what you're getting into, and My Dress Up Darling also has production values you generally don't find in most ecchi.

I would suggest your next watches should be:

First: [Shimoneta] (https://myanimelist.net/anime/29786/Shimoneta_to_Iu_Gainen_ga_Sonzai_Shinai_Taikutsu_na_Sekai) - bawdy humour, some interesting political undertones, solid story, pushes some limits but not too far.

Second: Yamada's First Time - a rather sweet romance that grows out of a very un-sweet premise, and a good example of medium level ecchi-ness meets romcom with the sort of things that ecchi offers that other genres doesn't have. Has one or two scenarios a little like My Dress Up Darling.

Third: Armed Girls' Machievelism - battle shounen, ecchi style. Lots of panty flashes, raunchy bits without pushing too far outside most people's comfort zones and an absolute banger of an OP.

Fourth - Highschool DxD, as everyone seems to end up watching this one.

Ecchi is a vast world from pretty tame to right raunchy. It looks like you lean towards the tamer side of things which isn't my forte. Most of the high school romances will contain a little ecchi. Here is what I could recommend for you:

The Helpful Fox Senko-san

To-Love-Ru

• Golden Boy
• Iya na kao sare nagara opantsu misete moraitai
• Miru Tights
• Aika
• Sprite
• Refrain Blue
• Lemon Angel

Kill la Kill

Valkyrie Drive: Mermaid Island - Pretty Good Yuri

Cat Planet Cuties - Action and Harem

Kiss x Sis - Step shenanigans

Date A Live - Spirits like Harems too

Kill la Kill is technically ecchi.

I also like monster musume. I heard there might be a new season

High School of the Dead, Monster Musume, and Sekirei. All anime’s I can think of at the moment.

Im watching Prison School right now and its a ton of fun, like its surprisingly suspenseful even. That is, if you dont mind to see some seriously fucked up shit.

I like monster musume

Já assisti tanto anime que provavelmente não vou lembrar de todos, mas aqui a lista, não esta na ordem

Date a Live

Kill la Kill

Kakegurui

Monster Musume

Ishuzoku Reviews

Mahou Shoujo Ni Akogarete

Prison School

Shimoneta

Shimai Maou no Testament

Vamos lá... Shinmai maou to testament, ishuzoku reviewers, Seitokai Yakuindomo (não é lá tão enchi mas tá valendo), High school of the dead, Rakudai Kishi (acho que era esse o nome), High school DxD, Kiss x sis, prison school, monster musume, to love Ru e acho que Panty & Stocking. Deve ter mais mas eu esqueci os nomes, tô ficando velho klkk

Finally, someone looking for ecchi anime! Let's see:

• Zero no Tsukaima
• Yuusha ni Narenakatta Ore wa Shibushibu Shuushoku wo Ketsui Shimashita.
• Tsugumomo
• Trinity Seven
• To Love-ru
• Taimadou Gakuen 35 Shiken Shoutai
• Strike Witches
• Strike the Blood
• Sora no Otoshimono
• Shokugeki no Souma
• Shimoneta to Iu Gainen ga Sonzai Shinai Taikutsu na Sekai
• Saijaku Muhai no Bahamut
• Renai Boukun
• Rakudai Kishi no Cavalry
• Punch Line (I really recommend this one)
• Prison School
• Oniichan no Koto nanka Zenzen Suki ja Nai n da kara ne!!
• Oniichan dakedo Ai sae Areba Kankeinai yo ne!
• Omamori Himari
• Okusama ga Seitokaichou
• Netoge no Yome wa Onnanoko ja Nai to Omotta?
• Nazo no Kanojo X
• Musaigen no Phantom World
• MM!
• Medaka Box
• Mayo Chiki!
• Masou Gakuen HxH
• Machine-Doll wa Kizutsukanai
• Macademi Wasshoi!
• Kore wa Zombie desu ka?
• Kore wa Watashi no Goshujin-sama
• Kiss x Sis
• Kill la Kill
• Keijo!!!!!!!!
• Kämpfer
• Kami nomi zo Shiru Sekai
• Juuou Mujin no Fafnir
• Isekai Maou to Shoukan Shoujo no Dorei Majutsu
• IS: Infinite Stratos
• Hundred
• Highschool of the Dead
• Hentai Ouji to Warawanai Neko.
• Hajimete no Gal
• Hagure Yuusha no Aesthetica
• Dagashi Kashi
• Busou Shoujo Machiavellianism
• Boku wa Tomodachi ga Sukunai
• Boku no Kanojo ga Majimesugiru Sho-bitch na Ken
• Astarotte no Omocha!
• Akiba's Trip The Animation
• Absolute Duo
• 5-toubun no Hanayome

I hope these are what you're looking for.

Prison school is one of my favourites and the first one I watched, totally recommend it. Also check grand blue it's good one.

Monster musume

Food wars. Has a fantastic plot also.

High school of the dead

I’m not a fan of echii but this has always been my favorite in the genre.

Ishuzoku Reviewers is king is the genre

Grisaia no Kajitsu and the other shows in the series

Kiss Sis🗣️

Strike Witches

•Prison School •Kill La Kill •Golden Boy •Freezing •The Testament of Sister new Devil •Shimoneta •High School DxD •Maken Ki •Food Wars •Chivalry of a Failed Knight •High School of the Dead.

Golden Boy and Prison School are pretty short but imo the best out of all of them and some of the funniest shows I’ve ever seen. If you’re more into action tho Kill La Kill is the way to go.

kill la kill or tsugumomo

or maybe monster misume

Harenchi gakuen by go nagai

Testament to sister new devil.

Prison School

Yamada's first time (or b gata h k). It's both ecchi and wholesome