ah I meant Warrior for fighter. Basically the classes that give you access to bows as melee units.
Assassins and Warriors give you the option of using a bow while being durable in Lunatic. This is very helpful against units with Counter, while you use a bow against everyone else with a ranged weapon, which this game really loves having.
Don't have Dread Fighter yet, but it'd be a great class for Owain.