He can do too many things so I'll just give you the info on how to find it.
This is basically a chapter of information on everything Akihito can do right now. He had master over Space, water, air, earth, fire, lightning, ice, darkness, light, matter= universal concept control/ reality.
You can also look up Kryptonians and go to DC database/ fandom
You can see the full extent of his powers by just looking up the element name then manipulation.
Everything listed is what he can do. With the exception of things in the Ultimate level for spatial manipulation.
And don't forget this is only his second world. I want to make him even more OP so yeah. There are still a few things that peak LN Rimuru can do to kill him, but I haven't red the LN and instead got it directly from fandom that gave me a detailed description on Rimuru and I don't see how people are saying goku can kill him.
Idc what you say goku get dropped the moment his soul is crushed and deleted.
🤷.
Go do what I said and if you don't idc but don't whine about anything when your favorite MC gets bodied and fuck issies sacred Rimuru still bodies.