Hello.

I'm looking for a cheerful yaoi..or to say it better. A cheerful, nice, happy-go-lucky (or something) seme (which wouldn't remind you of a (usually) dumb shounen protagonist (sorry if this offends someone (for some reson))).
Please no tragic past ukes.

Hope You can help. Thanks in advance :3

50X50 - this one one of the funniest yaoi i've ever read. The're both just silly 😛

Thanks for the recommendation. 50X50 was really amusing 🙂

Any more?

Oh, i'm glad you liked it 🙂
Another one from the same mangaka (also quite funny!) is Our graduation ( last chapter!). Unfortunately it's only an one-shot 🙁

Oo, thank you. I'll check it out 🙂

This manga fits the bill exactly: Honenuki ni Saretai, especially the first couple, but they're all really cute. A few of these also have really cheerful/care free semes, or if not that exactly, at the very least, they're all very sweet:
Uchi no Darling Eikoku Shinshi This one is pretty dorky though.
Mata Ashita
Café Latte Rhapsody
Harete Bokutachi wa which is shounen ai, and the sequel Dokidoki Renai, which is only slightly yaoi, but the seme fits the cheerful description.
Bokura ni Matsuwaru Etcetera This one is shounen ai, but I really loved the characters.
Koiha Ina Mono Mouna Mono I love the uke, he is amazing.

There are so many. 😮
I've read some of them, but they're worth rereading. Thank you KSenpai. 😀