No, not really. The only way to boost stats in this game is through equipment. At each level a character's stats are recalculated, and if any stat-boosting items are equipped at level up the character's stat-bonus values will get an increase.

HP = [Str * HPMod / 50]
MP = [Mag * MPMod / 100]

Spd = SpdBase + [Level * 1 / 10] + [SpdBonus / 32]
Str = StrBase + [Level * 3 / 10] + [StrBonus / 32]
Mag = MagBase + [Level * 3 / 10] + [MagBonus / 32]
Spr = SprBase + [Level * 3 / 20] + [SprBonus / 32]
MSt = MStBase + [Level * 4 / 10] + [MStBonus / 32]

SpdBonus = [Lv. * EquipBoost]
StrBonus = [Lv. * EquipBoost + Lv. * 3]
MagBonus = [Lv. * EquipBoost + Lv. * 3]
SprBonus = [Lv. * EquipBoost + Lv. * 1]
MStBonus = [Lv. * 5]