I need a name for the artist, since the kanji トロン came out as "toron" who's already an artist, and since I think the whole "pixiv_#########" is discouraged I need something else.

Sometimes I use the artist's login name from the image link:
"http://img30.pixiv.net/img/minoura-mino/3881238_m.jpg"
so you could use "minoura-mino".