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So this is what it feels like to be in the winner's circle.

Sirenoid (Japanese version: Siren (セイレーン, Seirēn?)) is a mermaid-like Bakugan that soothes souls with her magical lyre. She is the Guardian 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[]

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

Bakugan Ultimate Handbook[]

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 to destroy her opponents.


Bakugan Battle Brawlers[]

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. She sent Marucho's Limulus and Juggernoid, then with the help of the Ability Card Anthemusa, she sent Preyas to an unknown area, where he was affected by negative energy. 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 shown when Klaus battled Masquerade. After Hydranoid absorbed the power from Griffen and Stinglash and sent the later to the Doom Dimension she demeaned she fight. Dual Hydranoid then sent Griffen to the doom dimension. She then battled against Dual Hydranoid but when Klaus used peace maker the round ended in a draw. In round 4 she was used to battle Laserman. Masquerade opened his gate card giving Laserman more power. She then swam to Klaus's second gate card by using dive mirage. She then tells Klaus that his strategy will lead to failure. Duel Hydranoid then appears and mind ghost opens causing the Bakugan to be beaten. However Masquerade uses Grand down which nullifies the gate card. Hydranoid attacks Sirenoid with his energy blast and sends her to the Doom Dimension.

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 joins the battle in round 4 and battles Alice's Ventus Bee Striker though Alice wins the round when she used Reverse Blow on Bee Striker. She was shown watching Pyrus Siege and Haos El condor battle and defeat Bee Striker and mantris. She then notices the earth trembling during the battle. In round 7 she battled Darkus Centipod when it got on her card. Klaus opens his gate card to give her more power but it gets nullified by grand down. She then used forcing wave causing Centipoid to gets wiped out by Sirenoid's deep mist attack thus winning them the brawl. 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. After the Bralwers beat Hal-G and Naga she returns to Vestroia and says good bye to Klaus.

Bakugan: New Vestroia[]

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 (Deep-Sea Dive): Brings all opponents to Sirenoid's Gate Card.
  • Forcing Wave (Forcement Wave/Forcing Wind/Forcement Wind/Wave Blast): Adds 100 Gs to Sirenoid.
  • Dive Mirage: Moves Sirenoid to any different Gate Card and prevents it from opening. (Standard Aquos Ability)

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.
  • Vital Neptune: Nullifies the opponent's ability and adds 200 Gs to Sirenoid.
  • Ripple Shield: Subtracts 400 Gs from the opponent.

Ability Card (Bakugan Video Game)

  • Forcement Wave: Adds 200 Gs to Sirenoid.

Physical Game[]

Sirenoid was released as a B1 Bakugan and later released as a B2 BakuPearl. 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.


  • Sirenoid's name resembles that of a Siren, beautiful creatures from Greek mythology that supposedly took the form of a woman and lured sailors out to sea with their enchanting voices. Her name may also stem from Sirena, the Italian word for mermaid.
  • She, Shouko Marukura and Serena Sheen share the same English and Japanese voice actresses.
  • 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.