She gained her first seasonal CG for Christmas 2016 with a completely white outfit consisting of a double-breastedcoat, whitethighhighs and a santa hat with the only colored item being a green bowtie with very long ends. She is carrying a sack full of presents. Her Damaged CG shows her holding some presents as if to give them to the player.
Historically, the Maru-Yu submarines were of a highly unusual design, and initial tests failed to get the prototype Maru-Yus to actually submerge, causing many Maru-Yu jokes to involve her only managing to get her head underwater while her legs still flail above water. Kiso was nearby in the test runs, and Kiso's crew made jokes about the Maru-Yu's strange shape, causing some artists to treat Kiso as some sort of senpai to Maru-Yu because of it.
