Lapistia

He already has passive explosives. So, if not from the suggested options, it's better to take "Sturdy": +108 HP, +30% melee damage, and also +1 to accuracy and reaction – that's much more useful. "Agility" (lol) would also be very helpful. And "Affinity (Air)" would also be very useful, considering the character's low speed.

Added 22 minutes later
By the way, Frag, your image isn't displaying.