While searching through some Japanese website, I founded out they made an official manga based off the Minions, judging by the pictures in the comic it shows the minions in Tokyo. It's called "みらくるトリオ！ ミニオンズ".
I never really expected a western CGI animated film to get a manga adaption but I guess since the Minions are getting popular these days, it shouldn't be a surprise with all this merchandising.
I'd be happy if someone on here who knows Japanese could make a fan translation of this, or if a company like Viz Media or TokyoPop would liscense this and bring it here, considering how popular Minions are starting to become.
Well, I do know some of the Kanji characters as I'm a Chinese-speaking user and Hiragana/Katakana as well, though I can only partially understand the whole meaning of a Japanese sentence, but I guess I can help.