This isn't his art, but I'm pretty sure that "(/ﾟ∀ﾟ＼)れみりゃ☆うー" button is from gatau's site.

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I'd love that sticker for a case badge.

Not surprising - that's a very unusual kanji (變) used there. It's essentially an overcomplicated 変, making that sentence
イヤー　大変の物だねー　カリスマですから.

glasnost said:
This isn't his art, but I'm pretty sure that "(/ﾟ∀ﾟ＼)れみりゃ☆うー" button is from gatau's site.

It might be; I'm not sure whether gatau was the first one to put a button like that on his site or not.

HelepolisH said:
Charisma inside? Is this better or worse than KoaQuad.

According to the pixiv tags, it's an IntelKoa～⑨.