It seems to be an original character, so I added original to the copyright tags.
EDIT: Ah. Figures that I was wrong about that. But there wasn't anything in the artist's tweet that revealed who the character was. I just sought to correct that only the games were tagged and not the girl who is the centre of attention here.
Updated
I, uh,I think that once you enter a gamer's room,it would be a breach of manners to leave before playing some games, right?