Just give him a Red Salamander and turn him into the blaster. With full item setup for the fire magic he is one of the strongest characters for this role (second is Ember, she got hexes but her main stat is lower and her spellbook sucks). And with feats you can go standard caster routine - Point Blank + Precise Shot, 2 Spell Penetrations, 2 School Focus (Evocation), Bolster + Empower Metamagic.
If you get Sorcerous Reflex at MR2 he can double fireball in the first round of the combat, and with Hide Armor of Elemental Carnage + Crossblooded Sorcerer dip (I usually take it at lvl 17) + Second Bloodline he can amass as much as +4 Fire damage per dice rolled.