Shouryumaru・小竜丸
This shikai is basically just the handle with a handguard with a dragon's head. When Doragon fights with it he erupts flames out of it and he's able to do techniques like flamethrowers or a fire-blade (the fire-blade can be as long as he wants). The release phrase is 火悩を飲みこめ、小竜丸 or
Breathe of Flame, Shouryumaru.

Hukusyu no Shouryumaru・複讐の小竜丸
His bankai is an armored dragon. Each piece of armor can be disconnect and be controlled separately by using his raitsu. The bankai says together by him using a channel of raitsu to bind the pieces of armor together. He uses the handle he gets with this form like a leash, in which send raitsu to the bankai allowing him to control it with his arm movement. The bankai release phrase is　火悩で砕け、複讐の小竜丸 or Flames Asunder, Hukusyuno Shouryumaru.
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art (c) me
Bleach (c) Tite Kubo