Tsunade

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Tsunade is the former Hokage who help Manny to defeat Slient Naga in battle and even as that She have Fire Dragon Kekki Genkai mark on her arm also like rest of the Dragon Masters in the Kumogakure that cares for Manny to be a hero

but even also She willing to help Manny and his Gang defeat Nigel which is Manny's former Light clan master of the Kaijudo Dragons council as even that Tsunade use Armored Dragons

not when after Hiashi has became the Light civilization duel master even also as the Fire Dragon Kekki Genkai, Tsunade teach Manny the ways of the Fire Dragons to attack his enemies in combat and also She duels alongside with her creature was Morkaz the Defiant