Some Osprey/School of the Crane stuff!
His mutations included a heavily increased amount of myoglobin present in muscle tissue, increased lung capacity, and pressure endurance. These were unique to the School of the Crane to help Witchers endure lengthy times underwater, especially if they get pulled in mid-hunt.
Essentially trained as a free diver. Some early training involved cliff diving, this led to him fracturing his jaw on the left side, leaving it slightly crooked.
The scarring on the right side of his face is from being dragged under the water during a hunt, his face being pulled along the rocks and coral. The one on his throat is from a siren.
Slight wheeze to his breaths left from a reaction to the trails.
He literally never shuts up, he will talk your ear off the entire time on the boat you will be PRAYING a beast comes along to distract him.
Stylised tattoo of a hippocampus on his right shoulder, sea serpent spanning his back.
Gets landsick. Yes, that’s a thing. He basically bounces from boat to boat, it takes him a while to not feel queasy on land… or fall over as soon as he steps foot on solid ground.
Burn scars around his waist from tying himself to a mast with a rope, stupidly, and has since made his own gear to keep him from getting cast away to sea by a siren he has miserably failed at flirting with.
He knows the difference between sirens and merfolk, he flirts with both like an utter fool. He thinks it’s worth the try, even if that means being carried away by a siren.
Begging him to put on some armour while he’s flailing his dumb little sword and gun around he’s going to get himself killed.
Big of heart. Dumb of ass.