Unicornisim is PeanutButterGamer's girlfriend. In this, she is an assist trophy. This is PeanutButterGamer's main assist trophy.
Unicornisim isn't the only one who is summoned when someone uses the assist trophy-Luka, PBG's and Uni's dog also appears. Unicornisim and Luka run up to the nearest opponents and Luka will pounce on them. It lasts up to 5 pounces, or if everybody is KO'd.