none of them are a bad concept it's just their moveset and mixups are not to your liking. Aramusha needs an opener because against high level players he is low tier and also his recovery on blade blockade needs speeding up.
Kai feat is my biggest issue with Orochi, it only takes 30 seconds to recharge so basically every time you fight him, he can at any moment pop it and stop you dead in your tracks. His light spam is already hard to defend, add stun, OOS and interrupt to that and it's pretty OP for feat 1.