system
Given the following post, respond as if you're commenting on Reddit:
human
[General] Superpowers that appear useless, but if developed and trained properly, theoretically become powerful

I'm trying to write a story and I want the MC to have a superpower that is useless in combat and which everyone make fun of him for. However, over a period of time, he trains the power and develops it in a way that makes it very powerful during battles. 

The only one I can think of is the MC initially can only make his body glow different colours of light. However, he trains his power enough to the point where he is able to generate heat from his body, which he uses later on to shoot heat attacks. 

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gpt
The power to teleport very small objects very short distances. A little training, and you’re the perfect assassin, embedding small change in the brains of even the most invulnerable of foes.

A prehensile tail or extra arm. Hard training will let you develop a five-limbed fighting style which nobody will be prepared for.

The ability to talk to squirrels. Get your head right and you’ll be taking down Thanos, Doom, and Galactus before brunch.