Like you could turn your persona into a weapon and gain it's abilities

That would be pretty neat. If I remember correctly, you can do that in P5 to a lesser extent, so it's possible.

Oh yeah the electric chair

Well I mean with out the electric chair
Like the persona turns into a weapon but turns back after

Would be interesting. For example, if you weaponized, say, Izanagi, you could temporarily gain a sword that does elec damage in its normal strikes or something.

I actually thought of a weaponized izanagi but instead of o sword he turns into a lance