Parody sign & logo creator, artist.
Japanese name: 山桂 (reading is given as Yamakatsu)
Site name & circle for modeler-themed events: げんれい工房 (Genrei Koubou)
Circle name for doujinshi-themed events: げんれい工作室 (Genrei Kousakushitsu)
Old site name: 言霊参上 (Kotodama Sanjou)