Bakugan

Pyrus Dragonoid/Pyrus Delta Dragonoid/Drago (ノヴァ・ドラゴノイド)/Nova Dragonoid (ドラゴ): (voiced by Jason Deline) Dan's guardian Bakugan. He is a gigantic dragon-like Bakugan from "Pyrus": a space attributed to fire. He is one of the most powerful species living in Vestroia, able to infinitely evolve on his own. In battle, his power is to radiate heat from his body, dissolving everything around him and negating card abilities. He is the leader of the Bakugan; a true knight with strong convictions and deep friendship with Dan. During Shuji's Bakugan rematch against Dan in episode 1, Drago emerged from the playing field and joined Dan. Unlike other bakugan creatures, it is capable of breaking the effect of cards. He evolves into Delta Dragonoid in episode 22, with metal plated armor, a trident-shaped tail and enormous wings. Drago evolves again in episode 37 where he becomes Ultima Dragonoid. Drago's wings become red and covered with golden markings, Drago's horns are also curved back and sleeker, his "armor" is also pale gold and covers his arms, neck, and wings now.

Aquos Preyas (アクア・プレデター)/Aqua Predator: (voiced by Shawn Meunier) Preyas is a chameleon-like Bakugan & is Maruchos' guardian Bakugan. He's from the "Preyas Species" living in "Aquos": a space attributed to water. Preyas has the ability to change his molecular structure, due to his peculiar nucleus, to take on the characteristics of all the attributes: Pyrus, Subterra, Haos, Darkus, Aquos and Ventus. In contrast to his appearance, he has a very quirky sense of humour. He's completely dedicated to Marucho. He joined Marucho 6 months after it had appeared on Earth and eventually entered Marucho's new home in Episode 7. He can't evolve but he lays a egg in episode 30 that hatches into Angel/Diablo Preyas.

Haos Tigrerra (ルミナ・ティグレス)/Lumina Tigress: Tigrerra is Runo's guardian Bakugan. She's from the "Tigrerra Species" living in "Haos": a space attributed to light. Inside her body is a gigantic blade, capable of cutting any substance in the human world. She's very human in nature & trusts Runo completely: prepared to protect her no matter what. Tigrerra can also evolve. The bakugan simply appeared with Runo in episode 3. Tigrerra evolves in episode 32, A Tigrerra called Kenja is also seen in episode 42, with Pyrus colorings. Kenja also dies in the same episode.
Subterra Gorem (サブテラ･ゴーレム)/Subterra Golem: Gorem is Julie's guardian Bakugan. He is from the "Gorem Species" living in "Subterra": a space attributed to Earth. His entire body is composed of exceptionally hard cell bodies, which makes him a Bakugan with a very heavy body. He's gentle & obedient, but when he's angry, no one but Julie can calm him down. Gorem has an enormous shield that it uses to defend and weaken attacking bakugan. Like Drago, Subterra Gorem can also evolve. Gorem appeared in Julie's bedroom in episode 10 after she had tried to find her talking Bakugan in Bakugan Valley and failed. Gorem evolves into Hammer Gorem during episode 29.

Ventus Skyress (ゼフィロス・フェニックス)/Zephyros Phoenix: Skyress is Shuns' guardian Bakugan, a member of "Skyress Species" living in the space attributed to wind: "Ventus". Skyress has a gigantic wing span & numerous long tails. At the tips of her tails are three sharp feathers. She's clairvoyant & can see through objects; however, the ultimate ability of Skyress species is the ability to resurrect. She can also evolve. Skyress made its debut in episode 11, but Shun had received it from his ailing mother as a gift. Skyress evolves in episode 31 into Zephyros Storm Phoenix.

Darkus Hydranoid (ダークオン・ヒュドラ)/Darkon Hydra: Hydranoid is Masquerade's loyal Bakugan, a dragon creature with a very strong armour, revolting face and a sharp flail for a tail. He is from the "Hydranoid Species" living in the space attributed to darkness: "Darkus". His entire body is composed of a highly intelligent, independent cell structure. Though his mobility in battle is slow, he's mercilessly cruel and unforgiving. He later in episode 26 evolved into Delta Hydranoid, now bipedal with improved armor and a second head. Hydranoid later evolves into a 3-headed beast in Episode 37, The Ultimate Delta Hydranoid. Masquerade gives him to Alice before disappearing from her body.
Darkus Reaper (ルシフェル)/Darkon Lucifer: A Darkus Bakugan that frequently used by Masquerade to eliminate rival Bakugan, resembling a horned humanoid skeleton with deadly long wings and a long scythe. It had also been used by Ryo, Kenji. Their Reaper can talk like Masquerade's version can talk. Masquerade's own Reaper was later sent to doom dimension by Hydranoid during Dan vs. Shun and Masquerade match in episode 13.

Subterra Cycloid (サイクロプス)/Subterra Cyclops: Billy's talking Bakugan, a cyclops with a giant hammer that first appeared in episode 10. Cycloid joined Billy when one day Billy found the Bakugan in Bakugan Valley. He has also been sent to the doom dimension in episode 26.And Comes Back in episode 44
Wavern: Naga's twin sister and Joe's Bakugan, a Dragonoid who asborbed the Infinity core to battle Naga. Shes from a special attribute called Infinity but is registered in brawls as Haos. It is believed that she likes Drago.
Naga: A power-hungry Bakugan who was corrupted by asorbing the Silent Core with aspirations to get the Infinity Core. He is the one manipulating Masquerade from the start and is supposedly Hal-G's guardian bakugan. Just like Wayvern his attribute would be Silent.

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