http://www.mangago.zone/read-manga/momentum_park_ji_yeon/
Almost all of characters are smart and cool in momentum
http://www.mangago.zone/read-manga/here_u_are/ Uke is smart and seme has a cold personality
http://www.mangago.zone/read-manga/moritat/ Both uke and seme are smart (a bit too smart)
Here U are is not yaoi its shounen ai sorry
Moritat
Rutta to Kodama. It has some misunderstandings but they handle it smartly. :)
All About Lust
10 Dance
Sorenari Shinken nan desu
Seikaku kuzu de nani ga warui
Ordinary Men
Whore stop
drama manga won't match you probably. i think you should look more on slice of lives that has lesser twist or as you call "stupid characters".
http://www.mangago.zone/read-manga/futari_bocchi_no_shokutaku/
http://www.mangago.zone/read-manga/wazato_janakute_mo_gomennasai/
if you want you can look around http://www.mangago.zone/home/mangalist/50784/?filter=&page=10
Hi. I’m looking for a “smart” Yaoi manga. I’m not really particular about the plot. But I just really want to avoid stupid main characters. Stupid, uhm, like trying to be cute or.. a bad situation would’ve been avoided if the main characters were just smart enough. A cool or calm uke would also be nice. Thank you. :)