He is recruitable at Pidona when the city is being attacked by monsters. After clearing the event, he will hang at Pidona Weapon Shop.
Hector is a very useful asset for your party, he spots a cosplay-like Strength and Speed combination, 22 in each of those.
He has 19 Stamina, which is good, as a fighter, his Magic is low(13), but his Will is great for a fighter(20). His speciality is the Giant Sword.
Hector is quite tricky to recruit, but when you recruit him, he will prove to be an very powerful character.