Senku is one of the many main characters in Class-C, who is a human with a seemingly immortal (though not indestructible) body. He often gets injured during missions, though always pushes through to continue on as a member of the Association, that being said, he doesn't really know his reason for doing so, so his intent is a mystery even to himself.

Despite pushing through, he often thinks going overboard with "trivial" things like fighting and anything physical in general is a drag, so during instructive missions, he's always slacking off.