Pros:
Dodge once every round
Standard Attack is a hit-combo starter
Scaling (works wonders for mystery and his 30 hit chase)
Interrupt on 30 hit chase (if you get lucky you can shut down more than 1 mystery per round)

Cons:
Mystery is reliant on tag (high cooldown if you hit someone who is not tagged)
Very reliant on what team you're gonna build him with to achieve his full potential
Standard Attack is Ninjutsu. Even though he scales, his ninjutsu damage is going to be noticeably lower than his mystery and chase damage.
Kinda squishy if the dodge gets baited and he gets focused on

If you have any ninja that has chase based on amount of hits, then he'll work wonders. Team with him, kurama, and kisame is going to be difficult to beat