You probably already know Nagisa, the cosplayer and presenter. She now hosts her own show on Kao TV called "Gamer Girl Club" but it didn't go well with fighting games because her lack of devotion and practice.
On the other hand, Mui is a cosplayer and a legit P4U player. She has a lot of fighting games experiences as KOF97 is her first fighting game (now you probably get the idea how old she is). She played Fatal Fury and Samurai Spirits. She used to play Guilty Gear under alias Tatsumi.
Mui actually attended Evo 2013 and participated P4U tournament. She couldn't make it out of her first pool, losing to the guy who sent her to losers bracket again in the losers final. (And Mui said she wants to go to Evo again if she has money)
Caution: She's cuter than in this video!
P4U2 or Persona 4 The Ultimax: Ultra Suplex Hold will be released to the arcades early Winter in Japan.