He is recruitable after he is convinced by Bai-Mei-Ling to remove the player from prison.
Yan Fan is a real glass cannon in all terms, he has high Strength (18), very high Speed(23), and very high Magic, too(22).
He is specialized with Moon Magic, this is bad, since if you want to make him a real mage, you shall have to forfeit his high Moon Level to use Sun Magic, unless you have the Soul Jewel, then, forfeiting Moon Magic isn't necessary. But if you want to use him as a fighter, this isn't a problem at all.
He starts with decent weapon levels with all weapons, but it isn't recommended to give him any Rapier, Dagger, Bow or Gun because of his very low Dexterity(13).