Artist, Ukagaka ghost developer.
Artist name: くーげるしゅれいばー (Kugelschreiber, pronounced "Kuugerushureibaa")
(The artist said "I know the original pronunciation rather resembles a kind of "Kuugerushuraibaa." But that's a nickname, so plz don't care about it.)
Etymology of the name: "Kugelschreiber" is the German word for "ballpoint pen".
The other name: くーげる (Kuugeru or Kugel)
Circle name: あるてのてぃつ (Alte Notiz)
Site name: きゅろっとぱらだいす