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|variations = {{NilliousVariantList}}

|first = [[Origin of the Species Part 2]]

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{{Nihongo|'''Nillious'''|ニリアス|Niriasu}} is a multiple-headed hydra/dragon-like [[Bakugan]] that appears in ''[[Bakugan Battle Planet]]''. This deadly and powerful Bakugan is owned by [[Magnus Black]] and is a rival to [[Drago (Reboot)|Dragonoid]]. He initially appeared as a two-headed hydra/dragon with mechanical wings until his alteration in ''[[Bakugan: Armored Alliance|Armored Alliance]]'' in which he appeared more organic with real dragon wings. In both ''[[Bakugan: Geogan Rising|Geogan Rising]]'' and ''[[Bakugan: Evolutions|Evolutions]]'', he underwent training with Magnus and evolved into a three-headed hydra/dragon/centaur, then into an Elemental Bakugan with both his Strength and Speed Modes, before changing to a form similar to his ''Armored Alliance'' form in ''[[Bakugan: Legends]]''.