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Atlus USA have shared trailers for Adachi and Marie in Persona 4 Arena Ultimax. Both characters will be available as free DLC for one week after the game launches on September 30th, following which they will revert to paid DLC.
Adachi uses Magatsu-Izanagi as his Persona, while Marie is paired up with Kaguya.
Screenshots of Marie can be found below, too.