This is Cid from Final Fantasy 6 (FF3 in North America). In this game, Cid is researching Magitek Energy under the orders of the evil Emporer Gestahl. After the cataclysm, Cid and Celes are stranded on a small island. After Cid adopts Celes as his Grand-Daughter he builds her a raft so she can escape from the island, this leads to easily the most tragic part of the game. In order for Celes to leave the island she has to accidentally kill Cid by poisoning him with a rotten fish.