Method to Acquire - Speak to him with Roy on Chapter 16. You have to pay him 10,000 gold to get him on your team. If you decline, he'll offer himself for 8,000 gold then 6,000 if you decline again and then finally 5,000. However, the lower the rate you higher him at, the lower his stats are.
Damage - His damage starts out pretty good since he has an Elfire spellbook and it goes up pretty quickly. While he won't max magic by level 20 Sage, he'll still have good magic.
Critical - His critical is not that good, but it's not too bad either with supports and a Thunder.
Speed - He'll probably start hitting most enemies once but he'll be hitting twice in a bit.
Dodge - His dodge isn't that good but his HP will be in the 50's by level 20 and his defense and resistence are respectable enough that you won't worry too much about his dodging capabilities.
Growth Rates
HP - 75%
Magic - 30%
Skill - 30%
Speed - 45%
Defense - 20%
Resistence - 15%
Luck - 25%
Average Level 20 Sage Hugh(no Hard Mode bonus :[)
HP - 48
Magic - 24
Skill - 20
Speed - 24
Defense - 16
Resistence - 15
Luck - 16
Total - 163
Supports
Niime - 20/60/80 turns
Rei - 55/60/80 turns
Cath - 59/60/80 turns
Chad - 59/60/80 turns
Lugh - 59/60/80 turns
Rating - 8.6/10. While his stats do turn out pretty good, you have to be very desperate for spellcasters if you need him at the point he appears in the game. Steal his Member Card or hire him to get it because you WILL need that to purchase promotional items, something that is scarce in this game.