Ninjutsu Review!

[ItMe]

This is the problem with having multiple choices for the same kind of attack. You have four options for single target damage using your ninjutsu, and one is strictly better in most cases than the other three.
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Even if we took your suggestion of adding a DOT to fuma, there will be an objectively better and objectively worse choice. If the initial damage + DOT is the same or more than the damage on fuma over raiton, then raiton will never get used. If it's lower (or too much lower because of the 1 second to use a second mudra) then fuma still will never get used.

Multiple options can lead to redundant options, that's true. Though Raikai's suggestion could still be a way to get the player to use both. Use Fuma to refresh it's DoT, and use Raiton the rest of the time.