So basically Tengu can be used as a jungler or a support. However in either role, he's a tanky peeler, designed to take off enemies from the carries. Tengu's passive helps him jungle, in addition to catching up to enemies. I looked over stealing movement speed, and changed it to a normal slow, since the numbers would have to be basically nothing for the stealing to not be OP. His Q can either be Lee Sin's Safeguard or a short ranged dash that ministuns. W is a shield, buffing stats and giving energy when broken. E is an AoE taunt with a range similar to Rengar's roar, albeit smaller. It also restores energy like Shen. R is basically a small Xin ultimate, however is castable on allies. The knockback is much smaller than Xin's and scales on level. It deals much less damage, but is on a much smaller cooldown. At max level, it'll knockback enemies about as far as Vayne's condemn does.