Nothing is revealed so far about Necalli's background. He generally moves like a psychotic savage, with moves that resembles those of Bryan Fury, Ryuji Yamazaki and Wolverine. Once his V-Trigger is activated, however, his dreadlocks transform and his scars glow, he assumes a more sinister persona and obtains a new Critical Art finisher.
And just like Oni, his win animation has him interacting with his defeated opponent.
Take a look at Necalli's gameplay trailer below.