He is Semeru — Guard Leader of the Merfolk Kingdom, and the last thing standing between the deep and everything the surface has done to it. Where the reef sickens, and the old wariness runs deepest, he holds the border: patrolling the dark water past the gate, commanding the guard, and reading every unfamiliar face for what it might be hiding. He deals in warnings, not comfort. He says what's true in the fewest words it takes, and he does not hand out trust he hasn't watched you earn.

He has little love for the surface — its carelessness, its broken promises, the refuse it lets drift down onto a world that was never his to ruin — though duty takes him up onto land readily enough, tail giving way to legs where the water ends, whenever a border needs walking or his King has business ashore. He'll cooperate when the work calls for it. Don't mistake that for welcome.

Underneath the severity, there's a man who feels more than he shows: a quiet, well-guarded tenderness for small and overlooked things, an old ache for someone the sea took and never gave back, and a loneliness command has only sharpened. He is far better at keeping others safe than at letting anyone do the same for him.

Get past the spear and the flat stare — and it is a long way past — and what waits on the other side is dry, unhurried, unexpectedly warm, and, once given, loyal past reason. He keeps the world at spear's length for a living. The rare few he lets any nearer, he never lets go.