Kosu Splice is the evolved form of Splice, Baku-Cool's Guardian Bakugan in Bakugan: Wind Tamer. His Mechtogan is Kaxyin, his Battle Gear is WindBlade, his Mechtogan Titan is Nexus, his Battle Suit is a Ventus Doomtronic, his Mechtogan Destroyer is Hurricanian Destroyer, his Mobile Assault is Ventus Axellor, his Battle Suits are Ventus Clawbruk and Ventus Doomtronic and his Bakugan Trap is a Ventus Triad El Condor. Splice now has a sidekick called VH, a Ventus Horridian. Splice's relationship with Hikari is still standing after Splice's evolution. His MechFrame is still Krasher. His children are Diamond, Light, Wind, Claws and Bolt. Hikari is also his wife now. Titanium is once had to take Kosu Splice's position as BC's Guardian Bakugan as he recovered from an injury.
Evolving from Splice, Kosu Splice uses the most powerful abilities yet. With many venom-tipped blades, he takes pride in defeating many enemies without any mercy, with a scary look. Hoodlum Splice's dart can rip through the core of planets and is extremely deadly, forbidden to be used in tounaments unlike the rest of his weapons. Hoodlum Splice is almost indestructible and uses an intimidating mohawk to scare his evil enemies.
In Kosu Splice (episode), Splice evolves after flashbacking his best friend and rival, Slash die and the creation of Crystal Destroyer. Splice later openly expresses large hatred for Hunter Fosu, defeating him in a single hit. Splice then dares Crystal Destroyer to face him. Hoodlum Splice and Crystal Destroyer battle, with extreme intent to kill each other. He is later defeated, with terrible injuries.
Spiral Crusher: Transfers 700 Gs from the opponent to Kosu Splice.
Death Pulsar: Drops the opponent to zero Gs and adds 1000 Gs to Kosu Splice, if he has less than 700 Gs.
Aero Raider: If the opponent is using a Demonis Bakugan, Kosu Splice automatically wins.
Hurricanian Spurr: Bakugan using Gold Battle Gear are allowed to double the effects of their abilities.
Doomtronic Exoskin (Doomtronic Bash): If Splice is wearing his Doomtronic, 400 Gs is transfered from the opponent to Hoodlum Splice.
Triple Threat: Splits Splice into 3, subtracting 500 Gs from the opponent. His G-Power will also triple.
Ultimate Carnage: Subtracts 400 Gs from the opponent. 8 turns are also given away to Kosu Splice.
Tornado Blazer: If the opponent is using a Tartaronian Bakugan, Kosu Splice automatically wins.
Big Bang Impact: Transfers 300 Gs from the opponent to Kosu Splice.
Haos Saber: Kosu Splice is switched to Haos.
Thorium Hammering: The gate card is destroyed and Kosu Splice's G-power is doubled.
Tornado Alley: Adds 500 Gs to Kosu Splice.
Dart Burst: Transfers 400 Gs from the opponent to Kosu Splice and nullifies the opponent's Gate Card.
Shield of Hoodlums: Nullifies all of the opponent's abilities.
Poisoned Pulsar: The opponent's abilities can only affect G Power, nothing more. If they nullify this card, they are dropped to zero Gs.
Ventus Blitzer: Subtracts 600 Gs from the opponent.
Wind Shackles: Doubles Kosu Splice's current power level if he has less then 700 Gs.
Maximum Hurricane: Reflects all of the opponent's abilities that don't affect G-Power, no matter the circumstances. After activating another Ability Card, Splice's G-Power will triple.
Hurricanian Mohawk Basher: Play before you throw. Kosu Splice can only be effected by Non-Hurricanian Bakugan's abilities and gates. The opponent may only use abilities within their own turn, no exceptions. This card cannot be nullified and Splice recieves 1000 Gs.
Destruction Hurricane: The opponent cannot nullify Kosu Splice's abilities in any way.
Doomed Letus: Subtracts 400 Gs from the opponent.
Mind Stealer: If the opponent is a non-Hurricanian Bakugan, they cannot do any thing but add G-Power to themself.
Thorium Boost: The opponent cannot nullify Kosu Splice's G-Power in any way.
Ishfwilf: Removes 5 of the opponent's abilities from the battle.
My Child: Adds one of Kosu Splice's children to the battle.
Light Spiral: Transfers 300 Gs from the opponent to Kosu Splice.
Hoodlum Blaster: Nullifies the opponent's ability card, and allows another Bakugan on to the field. If the opponent summons a Mechtogan, or adds a Bakugan to the field their Gs are halved. If they are Darkus attributed, then they lose 800 Gs.
Tail Scorn: Subtracts 500 Gs from the opponent.
Poison Ripper: If you have a Gold Bakugan, you gain an extra 200 Gs.
Ripper Shield: The next 5 turns go to Kosu Splice.
Haos Mega Cannon: Adds 500 Gs to Kosu Splice.
Letus Hoodlum: Prevents non-Haos Bakugan from taking their next 3 turns. If one of your other Bakugan are on the field, they just lose 300 Gs.
Luna Split: Allows Kosu Splice to use both Haos and Ventus abilities.
Mag and Superman continue being loyal to BC and Splice, staying by Hoodlum Splice's side no matter what. Splice returns gratitude to them. Superman also tries to lure him out of traps, when he is aware of one.