He has a split personality, one of an angel, the other of the devil. When he's an angel he is fun to be around, but when he is in devil mode, he is frighteningly cruel and no one can stop him. Stoica has lots of trick moves during battle and opponents have a hard time reading him. He has saved Gundalia many times with ingenious battling abilities. He is the youngest member of the Twelve Orders. It is unknown why, but somehow he was able to breathe underwater as shown in episode 14, when he was easily beating Marucho.
It is said that Stoica has a split personality: as an angel, he is fun to be around, but as a devil, he is frighteningly cruel. He is loyal to Barodius, though it is unknown whether that loyalty is more for his own gain or if it is genuine devotion. Either way, he was always suspicious of Gill, and figured out Airzel was lying about Fabia killing Kazarina. He also disliked subordinates like Jesse Glenn, and like Kazarina, had no problem with disposing of them to save his own skin. However, he seemed to get along with Lythirus.
He may tend to go overbroad with his enemies, going as sure as using an ability in spite of the fact that he will get Lumagrowl drowned in the process. He also had been smart enough to figure out that Dan and Shun were swapping Bakugan and was able to get Airzel to admit that Gill had killed Kazarina. He thinks highly of himself, as seen when Stoica complained that Gill should send Airzel to Bakugan Interspace instead of him.
Stoica made his first appearance in Revelation, he and the other Twelve Orders members were talking about Linehalt and Drago and also about how Drago is too strong. Airzel berates Stoica, saying that he should take things seriously for once.
He reappeared once again in Hostile Takeover talking about getting the element.
In The Sacred Orb, he, along with the rest of the Twelve Orders, chews out Ren and his team (except Sid) for not convincing the Battle Brawlers to join them instead of the Neathians calling the Agents pathetic. He and Lythirus later battle the Castle knights beating them rather quickly. He then fought Marucho Marukura and Akwimos. He was doing fine until the Sacred Orb transported all Gundalians the away.
As said by Captain Elright in Decoy Unit while introducing the Twelve Orders to the brawlers, Stoica can change his personality from Joker to ruthless savage. His ship, along with Airzel and Kazrinas's ships were seen heading for the third and final Neathian shield.
In The Secret Switch, he and Lythirus appeared with Jesse Glenn and Plitheon. They battled Fabia Sheen and Aranaut and later Dan Kuso and Hawktor. Despite his ingenuity, he did not realize that Dan and Shun Kazami switched their Bakugan before the battle. He and Jesse ultimately lost to Dan and Fabia, even when Stoica pulled out his Battle Gear Razoid.
He appeared in Battle For the Second Shield, saying that Kazarina would have problems with a smirk on his face.
In Curtain Call, he appeared alongside Kazarina trying to decide who else they can blame for their failures in stopping the brawlers. He decide to blame Jesse, but before they can punish him he escapes from his cell. Once Ren brings Jesse back after their loss to Jake and Fabia, Stoica and Kazarina eliminate him and use Lumagrowl and Lythrius to defeat Plitheon after he turns on Jesse. Then on their way to tell Barodius of Jesse's elimination, Nurzak berates them for needless punishment of a fellow operative, Nurzak even claims he can "smell" their treachery.
In Mobile Assault, He is sent to Neathia along with Gill and Airzel to keep the Battle Brawlers busy while Kazarina upgrades Dharak's Colossus Armour. When Stoica complains about their job, Airzel tells him to be quiet as Kazarina might overhear. On Gills orders, Stoica goes with Ren to Bakugan Interspace changing into a human disguise. Then he says he wants to hunt humans in their natural habitat and heads to Earth where he brings Koji to Gundalia to be hypnotized by Kazarina.
In Dragonoid Colossus, he faces Marucho in a rematch and beats him after a long fight. He retreats with the rest of Twelve Orders when Linehalt uses his forbidden powers.
He reappeared in True Evolution with Kazarina confronting Nurzak and Fabia as they try to make it into Kazarina's lab.
In Redemption, he teamed up with Kazarina to battle Nurzak and Fabia. With the help of their Battle Gear, they broke a hole in the floor and defeated them, but later rematched them in round 2. This time, Kazarina hypnotized Jesse, Lena, and Zenet to help them, but Stoica used an Ability Card called Death End Merman that flooded the entire arena to attempt to kill Nurzak and Fabia. Kazarina, Lena, Jesse, and Zenet were forced to retreat because of this. Somehow, he talked underwater like he could breathe it.
In Final Strike and Dream Escape, he ambushed Shun and Faiba as they tried to free Dan. He then battled Shun to no result as Shun retreated once Dan and Jake were rescued. He later regrouped with the rest of his team, eager to fight the Battle Brawlers now that they had them all where they wanted them. When the Battle Brawlers tried to return to Neathia on Dragonoid Colossus to stop Barodius and Phantom Dharak, they quickly pulled out their Bakugan to stop them from leaving.
In Gundalian Showdown, he battled the brawlers on Gundalia with Kazarina, Gill, and Airzel and lost due to Blitz Dragonoid's new powers. He alongside Gill and Airzel were supposed to go to Neathia to help Emperor Barodius but only he and Airzel left because Gill's ship was supposedly damaged and although Airzel didn't suspect anything Stoica seemed suspicious about why Gill hadn't gone with them.
In Broken Spell, he and Airzel fight Shun and Dan to prevent them from reaching Barodius and Dharak, saying the only way they'll get to them is through them. When Jesse, Lena and Zenet break free from their brainwashing, he reveals that he overheard Gill talking with Airzel about Kazarina and forces Airzel to admit that the reason that Gill stayed behind was to kill Kazarina himself. When Airzel was confessing this, Stoica turned on the speakerphone so Barodius can overhear it.
In Code Eve, he Bardious and Airzel begin to fight the Bralwers and Ren's team with the help of Gundalian Solders. Sometime later Gill arrives on Neathia and tries to pin Kazarina's murder on Fabia, but Barodius reveals that he knows it was him who killed Kazarina. A shocked Airzel is at first unable to understand how Barodius found out, but he quickly realizes that it was Stoica who told him. Stoica watches Gill and Airzel get killed with no remorse. He helps Emperor Barodius attack Neathia to get the Sacred Orb. He and Lythirius blind Dragonoid Colossus so Dharak could attack him, but Dharak betrays them and all three of them are killed by Dharak's attack.
Bakugan: Gundalian Invaders
- He is the only member of the Twelve Orders whose hair doesn't correspond with his attribute.
- His supposed angel/devil personality may be a reference to Angelo/Diablo Preyas.
- In Bulgarian, Stoica (Stoika) is a female name.
- Stoica's human disguise is similar to the outfits worn by members of SOLDIER from the video game, Final Fantasy VII.
- Stoica was the only Gundalian to have stayed loyal to Emperor Barodius until Phantom Dharak betrayed and killed him with his Guardian Bakugan.
- His name alludes to the word stoic meaning self-control. This is ironic as he seems to have no self-control.
- Stoica likely didn't like Gill very much. As he didn't seem to care at all when he and Airzel were killed.
- He is the only member of the Twelve Orders (excluding the Gundalian Agents) that is seen with a human form or disguise unlike the other main members.
Like the rest of the Twelve Orders Stoica is a strong brawler, only losing three battles.
Bakugan: Gundalian Invaders
|The Castle Knights (Tag with The Twelve Orders and Gundalian Agents)||Offscreen||Win|
|The Castle Knights (Tag with The Twelve Orders (except Barodius) and various Brainwashed Brawlers)||14||Win|
|Marucho Marukura||14||No Outcome (got teleported away)|
|Dan Kuso and Fabia Sheen (Tag with Jesse)||16||Lose|
|Jesse Glenn (Tag with Kazarina)||18||Win (due to Lumagrowl and Lythirus surprise attacking)|
|Marucho Marukura and Jake Vallory (Tag with Gill)||24||No outcome|
|Nurzak and Fabia Sheen (Tag with Kazarina, Lena, Jesse, and Zenet)||32||Win (due to Gundalian reinforcements)|
|Shun Kazami||34-35||No Outcome (opponent retreated)|
|The Battle Brawlers (Tag with Gill, Kazarina, and Airzel)||36||Lose (due to Drago's rage)|
|Dan Kuso and Shun Kazami (Tag with Airzel)||37||No Outcome|
|Battle Brawlers, Gundalian Agents, (except Sid), Castle Knights, and Nurzak (Tag with Barodius, Airzel, and various Gundalian Soldiers)||37-38||Win|