One for all prime is essentially one for all ultimate but alot more usable.Its moves are all around amazing and it it has decent startup speed for its ultimate, it can also trap opponents to deal alot more damage, Unlike hellflame manifests best move is its ultimate and it also is heavily reliant on your opponent not moving. Hellflame is placed at the top of A-tier because its a highly versatile quirk, its ultimate down to its move are all unique and have decent AOE although it having 2 moves that does essentially the same is not ideal.Although is slightly below as it lacks the quick firing launch. Its AOE Move hits alot of opponents and can mess up the stage, healing and also its ultimate is quite powerful and has somewhat use over dark shadows. Overhaul is placed slightly before Dark shadow for its versatility.
its Ultimate is also useful if you want to escape a tight situation It is very powerful when played corrected and is quickly obtained.