A Ghost

(Love the contrast of a cute, harmless-looking character with ridiculously overpowered strength.) White hair, red eyes, invincible (What other tags might attract readers? <(._.)>) A child who has forgotten everything awakens from a war. They are a sealed calamity. But also a very cute calamity. Basically, the little one visits all sorts of races, cuddles up to the good people, and helps them beat up the bad guys (?) And now, time for some cryptic riddles: A memoryless ghost drifts across the land, no longer recalling their past. Bewilderment shrouds their heart, so they set off in search of answers. No one answers their calls, until the world crushes their former self, until history holds no trace of them. Forgetting is the final death. Only when this final death befalls them can there be a new beginning. They are the roar of a race, a roar suppressed for ten thousand years. Now someone wants that roar to ring once more in the ears of those who wait.