She's a mature umamusume who is presumably substantially older than her schoolmates, probably even older than her trainer. Maruzensky isn't quite familiar with recent trends, and she uses a lot of words which was fashionable in the 80s... She likes Eurobeats.
She is dubbed "Supercar". She is crazy with speed, both with running and driving. She has a red Lamborghini Countach, which she calls "Tacchan".
She lives alone outside. She likes teasing other younger girls and her trainer.