Cless is best known as the hero who defeated Demon King Tooru, though he's probably even more impressive for his ability to think on his feet during combat. He rose through the military ranks fast, leading successful operations against monster nests across the Human Kingdom—the kind of tactical work that actually wins wars rather than just winning battles.
What fans often note is how genuinely selfless he is. He's the type who puts others first without making a big deal out of it, which makes sense given his background as a soldier. He's also Helck's younger brother, which is worth keeping in mind for context.
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