[quote=@Crimmy]
No I mean like: physically and narratively how does he facilitate the use of the combination attack. Does his Persona just stand in the way or something and channel those spells into a combo?
[/quote]

How about...the other users aim their attacks at him. He can have a draining effect that takes the attacks and a color corresponding to the attack shows up in one of Vayu's hands as an orb like material. When he has two or more of these orbs, he can launch a fused spell. I was thinking Akira could only have access to two of the six hands when he begins and gradually open up more hands when he grows closer to the other users, mainly for balance purposes and the like. And obviously, this'd have to come with a huge drawback so I was thinking he could be a glasscannon who's weak against any physical attack to make up for this. If that still sounds way too broken, I'll just make it a basic resistance, even if that'd mean he'd have to get hurt to even use the spells.