can あなた find me a good anime?

ヘタリア - Comedy
Kids On The Slope - Slice Of Life
宇宙 Dandy - Comedy
Fruits Basket - Romance and Slice Of Life
Bakuman - Slice Of Life

One Piece

best comedy アニメ ever.................he he eh eh

High school and comedy? So あなた want something もっと見る like slice of life? Here are some i think あなた will like with comedy:
-Ouran High School Host Club (but i bet somehow あなた already watch it)
-Special A (Similar somehow to Host Club)
-Itazura na キッス (Which is also Shoujo)
-K-ON! ( From what あなた asked, this one is perfect for you)
-Kachou Wa Maid-Sama! (Also Shoujo)
-Acchi Kocchi (Really funny)
-Lovely Complex (One of the most hilarious animes i have ever watched, it also has shoujo)
-Sukitte Iinayo (Huge in shoujo and romance)
-Kimi ni Todoke (Romantic comedy)


Now high school, comedy and fantasy! (some of them might have romance または action) :
-Sakura Card Captor
-Shugo Chara
-Gakuen Alice
-Fruit Basket
-Soul Eater
--Kokoro Connect (It has funny parts but also has drama, also supernatural)

And i personally really like To Aru Kagaku No Railgun, which is a side-story of Toaru Majutsu no Index. But あなた don't need to watch it in other to watch To Aru Kagaku no Railgun, but both are great.

Anyways, hope i helped and あなた like any of those.

K-On!
エンジェル Beats!
愛 Live! School Idol Project
NouCome
Chuunibyou demo koi ga shitai!
WataMote

I always like watching ongoing series because it gives me something to look foreword to each 日 so I thought I should tell あなた about my お気に入り ongoing series'.

Gokukoku no Brynhildr - Sundays
Hitsugi no Chaika - Wednesdays
Mahouka Koukou no Rettousei - Saturdays
No Game No Life - Weenesdays
Sidonia no Kishi - Wednesdays
Medaku City Actors - Saturdays
Kamigami No Asobi - Saturdays
Captain Earth - Saturdays

Now for some completed series

-Bleach
-Naruto
-D. Gray man
-Fullmetal Alchemist*
-Soul Eater
-Gurren Lagann
-Death Note
-Blue Exorcist
-Kiba
-Tiger and Bunny
-Broken Blade
-Naruto/Naruto Shippuden
-Attack on Titan
-Sword Art Online
-Hakkenden: Eight イヌ of the East
-Persona 4: the Animation*
-One Piece*
-Devil Survivor 2: The Animation
-Karneval
-Hunter x Hunter
-Nobunagun
-Noragami*
-Buddy Complex
-Hamatora: The Animation
-Strike The Blood
-Beyond The Boundary
-Tokyo Ravens
-Z/X IGNITION
-Pandora Hearts

Edit:
I forgot to look at the 説明 to see what あなた were looking for. The shows above are pretty much all action/adventure but almost all of them have comedy in them. I'll mark the ones with the most comedy with an *. So here are some of the shows in the genre you're asking for.

-Nichijou
-Hetalia

Hetalia