Naruto6p full sb pos1, edo Nagato full sb pos2, your main char pos3 and Rin pos4 with the Chameleon for summon can be your regular team for most of the PvP events, but not for Nine Tails and Rogue Ninja events.

Iruka full sb can be one more usefull ninja to buff your Naruto.

Hashirama New Year and Guy summer can be good units for arena ranked

Try getting King Of Hell summon and/or Gamariki