Am Chouno is part of an idol unit known as "Rummy Labyrinth" along with Luna Yumizuki.

She uses a Granblue deck with "Vampire Princess of Night Fog, Nightrose" as her ace.

It was revealed in episode 17 that she is also Ace, the person responsible for Shion Kiba's family losing their company.
(Source: Cardfight!! Vanguard Wikia)