Seiya Ryuuguuin

The Hero who was summoned to defeat the S-Ranked Demon Lord terrorizing Gaeabrande is overly-cautious in everything that he does despite the immense power at his disposal. Some think this is because he is cowardly, when in truth he's spending every waking moment training as hard as he can in order to prioritize the safety of the world: which will fall should he die.

Example of:
The So-Called Coward