I thinks that's why itagaki didn't want her in NG to begin with, since all the murder fun time clashes with her innocent personality, but once he bounced TN was like "fuck it, let's get crossover CRAZY!"
Well to be fair, she isn't actually canon there so it's not really overall damaging anyway...
And to be even more fair, despite her innocent personality, she did swear and kill Raidou and probably killed the ninja after her head on top of killing Alpha so...