noun
battle maniac; combat-crazed person
Describes someone who is obsessed with fighting and lives for the thrill of combat. Often used in fiction, games, or to describe a person with an extreme love of battle.
彼は戦闘狂で、戦いのない日は退屈で仕方ないらしい。
He's a battle maniac, and apparently he can't stand days without a fight.
そのゲームのキャラクターは戦闘狂として描かれている。
The character in that game is portrayed as a combat-crazed person.