Is that a Genderswapped Koishi I see?

I'm inclined to think the two at the bottom of the center page are Twitter-tans of some sort, given the gentleman's hat, the twitter pixiv tag, and the fact that 「それはあなたです」 seems to have some relevance to the Japanese twitter that escapes me (since I neither use twitter nor understand Japanese proficiently.)

Anyone more savvy on the matter?

Oh god this is the first artist to make me like Nue.