People are getting very hung up on the imbalanced niche abilities of Blue Mage without recognizing their huge list of abilities that offer bits of unique support or relatively normal damage options. You could certainly balance abilities like Aqualung, Magic Hammer, Goblin Punch, Off-Guard, Shockwave Pulsar, Level x Flare, Level x Holy, Dragon Force, Twister, Matra Magic, Vampire/HP Drain, Angel Whisper (longer cooldown Warden's Paeon?), Grand Delta, Trine, Lancet, etc. etc. etc. etc.

The crazy weird unbalanced gamebreaker abilities are in the minority. And really, would they be that fun to use in this game anyway? Woo hoo, we get to use Level 5 Death on some enemies in the overworld. They already die in 3 hits maximum anyway. Yay, Self Destruct.

I feel like I'm crazy for thinking Blue Mage's identity isn't so fragile that it needs these weird skills to exist and be considered a Blue Mage.