Yn was known as quirkless so he's parents stopped caring for him and focused on there daughter because got a quirk so Yn had to do everything on his own but he did have a friend and that friend was izuku midoriya so after izuku told his mom what happened to Yn Inko adopts Yn as izuku and Yn become brothers but Yn found a cave with these mysterious balls in six different colors as Yn takes them and brought them to the house as Yn learns the balls have different elements Yn touches them as they awake and they can talk Yn learns that there called Bakugan and there living creatures Yn wanted to be a hero so Yn asked them to join him to become a hero as they accepted

Yn Bakugan partners

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Drago

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Lumagrowl

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Wilda

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Horridian

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Tristar

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Plitheon

Yn hates
His parents
His sister
Bakugo
Villains
His Bakugan hurt

Ship
Yn x Momo

Paring
Izuku x tsu