From The Bakugan Wiki
  Main   Gallery    
So this is what it feels like to be in the winner's circle.
Sirenoid, GAME OVER
Attribute Aquos Aquos
Power 370 -> 400 Gs
First appearance The Story of Vestroia
Voiced by Julie Lemieux

Sirenoid, Siren (セイレーン, Seirēn?) in the Japanese version, is a mermaid-like Bakugan that soothes souls with her magical lyre. She is the Partner Bakugan of Klaus von Hertzon.



Sirenoid is a mermaid-like Bakugan wielding a magical lyre to soothe souls. Sirenoid creates a forceful wave to boost its power and destroy its opponents. It uses its dolphin-like tail for speed and mobility.

Bakugan Official Handbook[edit]

The graceful Sirenoid is quite a catch for any brawler! The mermaidlike Bakugan wears long, flowing robes and protects herself with the harp she carries.

Bakugan: Ultimate Handbook[edit]

You won't find this mermaid-like Bakugan in any fairy tale! It's true, when Sirenoid plays her lyre it can calm the souls of everyone around. And she can use her long tail to swim gracefully through the water. But Sirenoid can also create a forceful wave that will boost her power-and destroy her opponents.


Bakugan Battle Brawlers[edit]

Sirenoid shares a special relationship with her partner Klaus von Hertzon. She wears a long, flowing robe and protects herself with the harp she carries. Sirenoid is mostly based on Sirens that lure in sailors by looks or by any devious way like how Sirenoid uses a harp. She is in love with her master Klaus von Hertzon and when she is living in Vestal, she lives in the fish tank of Klaus' office, albeit in her open Bakugan sphere form. This is referencing the fact that she is an Aquos Bakugan. Aquos Sirenoid shares a close bond with her master brawler, Klaus von Hertzon. Whenever she loses a battle she asks him to forgive her.

When Preyas first saw Sirenoid, he thought she was beautiful. With the help of the Ability Card Anthemusa, she sent Preyas to the Doom Dimension, as well as Marucho's Limulus and Juggernoid. She then battles alongside Fourtress and Tentaclear against Drago, Tigrerra, and later Preyas, but was defeated when Drago evolved. She sent Dan's Griffon to the Doom Dimension. While under the influence of negative energy from the Silent Core, her personality was very vicious but after being freed from it, she appeared more calm and caring. She is then sent to the Doom Dimension after being defeated by a newly evolved Hydranoid.

Sirenoid came back to Klaus after the Legendary Soldiers of Vestroia sent all of the Bakugan from the Doom Dimension back to Earth. After Sirenoid is retrieved, Klaus battles Alice when she comes to his castle. Sirenoid wants to defeat her very badly, calling her a coward when she refuses to fight, even though Klaus and Sirenoid win anyway, though she could have been acting to help Klaus motivate Alice as she acted calm the next time she saw her. She later assists in stopping the Doom Beings by taking on both Hairadee and Druman, attacking them with Forcing Wave, though she wins after being pumped up by the Silent Core she quickly loses in a rematch. She later assists in battling Rabeeder with Alpha Hydranoid and Juggernoid but lost when Rabeeder used Terra Crunch. She then helped most of the other brawlers in battling the remaining Dooming Beings.

Bakugan: New Vestroia[edit]

Sirenoid is seen in Invasion of the Vestals playing her harp before the Vexos capture all the Bakugan. After being freed, she is seen playing her harp again, while watching the Resistance go their separate ways.

In Reunion, Sirenoid is seen again playing her harp.

Ability Cards
  • Anthemusa: Sirenoid attracts all opponents to her Gate Card. Additionally, if the opponents are from the same team, their G-Power does not combine like on a Triple Battle.
  • Forcement Wave (Forcing Wave/Forcing Wind/Forcement Wind): Adds 100 Gs to Sirenoid.
  • Dive Mirage: Moves Sirenoid to any different Gate Card and prevents it from opening.

In Saved By the Siren, Sirenoid later rejoins Klaus when he goes to Vestal and aid's in Ace's defeat of Mylene. When Klaus congratulates her on her victory, she blushes in a bashful fashion. For some reason, Klaus keeps Sirenoid in a fish bowl. She also acts as Klaus' secretary, informing him of any meetings and events he must attend to during the day.

Ability Cards
  • Devora Anthemusa: Nullifies the opponent's ability and adds 300 Gs to Sirenoid.
  • Final Neptune: Nullifies the opponent's ability and adds 200 Gs to Sirenoid.
  • Deep Sea Dive: Nullifies the opponent's ability.
  • Ripple Shield: Subtracts 400 Gs from the opponent.

Ability Card (Bakugan Video Game)

  • Forcement Wave: Adds 200 Gs to Sirenoid.

Physical Game[edit]

The Haos version has 460 or 490 Gs. The Aquos version is available with 620, 630, 480, 460, or 430 Gs Gs. The Darkus version has 630 or 550 Gs. The Subterra variation can come with 580, 530 or 390 Gs.

In Japan, its Aquos version in BCV-02 it comes with 250 Gs or 450 Gs.

Trading Card Game[edit]

Image Card Name Card Type Card Series
BA136 GA SM tsunami F.png
Tsunami Silver Gate Card 4/48
BK PD Card244.png
Aquos Vortex Silver Gate Card 1/48c
BA255 GA sirenoid 12.png
Sirenoid Gold Gate Card 12/48c
BA309 GA charging grounds 18d.png
Charging Ground Copper Gate Card 18/48d
Water-Power Boost Blue Ability Card BA11


  • Sirenoid's name resembles that of a Siren, beautiful creatures from Greek mythology that supposedly took the form of woman and lured sailors out to sea with their enchanting voices. Her name may also stem from sirena, the Italian word for mermaid.
  • Sirenoid is similar to Harpus, as they have very similar ball forms.
  • She has some similarities to Monarus, in both ball and Bakugan form.
  • Her ability, Anthemusa comes from the small group of islands where Roman poets thought the Sirens might lurk.