Famitsu has shared a first look at Marie, a DLC fighter releasing for Persona 4 Arena Ultimax.

I'm not seeing any sort of weapon or the like in Marie's hands, so maybe she uses martial arts like Chie or just magic or something. Marie is aided by Kaguya, the ultimate Persona of her Arcana. In the few shots we can see Kaguya manipulating lightning and doing something strange to Yukiko

Marie and Kaguya look quite good together, as I'm sure you'll agree, once you view the screens below.