u use him with minato and iruka so you dont have any crowd control debuff (yes minato have interruption but then the oppo will just not mys and wait after your min)

so chase immobile is reccommended...

2nd priority for me is extra shields (go up to +1 or +2 is up to u), then 3rd is extra defense on the super armor passive... his mys is not that recommended if u don't like or have enough survival points to spam his frags... but since his mys is so broken in pve and sometimes in pvp too... mys +1 will be more broken...
...

and rmb to save some vials and dusts for when his skill trial comes out to break his standard to Y (create shield like earth main) and if u want him to be more support... break his mys to Y+2 too... 60% buff to wind ninjas is nice...