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{{Nihongo|'''Nillious'''|ニリアス|Niriasu}} is a [[Darkus]] [[Nillious]] multi-headed hydra/dragon like [[Bakugan]], and one of the main Bakugan characters from the [[Generation 2]] Show.

He is the [[Partner Bakugan|Main Bakugan]] of [[Magnus Black]], and the Rival of [[Drago (Dan Kouzo)|Dragonoid]]. Initially He initially had a two-headed hydra/dragon-like design; later on in the show, he got a three-headed, hydra/dragon/centaur-like aspect due to an intense training regime that was realized alongside his human partner.

The double headed Nillious 's main motive in brawls is to kill - not to win. He does not like fighting as a team with his partner, Nillious is out satisfy only himself. He likes to go rogue. Each head has own personality and ability. Untamable and vicious Magnus has his hands full keeping Nillious in line.<ref>[https://web.archive.org/web/20220127211045/https://bakugan.com/en/bakulog Nillious' BakuLog entry]</ref>

In ''Battle Planet'' he appears as a two-headed hydra/dragon with mechanical wings. Later on in ''[[Armored Alliance]]'' he has a more organic aspect, with natural dragon wings instead of mechanical ones.<br/>In ''[[Geogan Rising]]'' becames , he becomes a three-headed hydra/dragon/centaur due to a training realized with his partner; and then turned into an Elemental Bakugan on in ''[[Evolutions]]''