We are rated M.
Suffice to say swearing, so long as it isn't ridiculously excessive and that PCs censor is not bypassing should be acceptable.
Also, I'll have Shin talk to the rest of you again soon but I'm busy doing a university assignment right now.
Aki and Shin would probably make a good combination since they are both good at Genjutsu, although Shin's best Genjutsu requires someone to back him up physically or with ninjutsu lest he get attacked from behind and risk breaking his concentration.