With the recent announcement of Blue Dragon Ninja, I thought I'd give my take on a new Dragon Ninja.
Black Dragon Ninja
When this card is special summoned by the effect of a "Ninjitsu Art" card: target 1 "Ninjitsu Art" card in your graveyard; banish that target. When this card leaves the field:add 1 of your banished cards to your hand.
If you summon him with Ninjitsu Art of Super-Transformation, you can get the one of your Ninjitsu Arts back once he leaves the field. Also, because he's Dark, he works with old school ninjas like Strike Ninja.