Peeboo's SP Recovery

As I've been playing on harder difficulties, I've started to appreciate Peeboo's versatile Carrot Transformation spell more and more. This spell is awesome! It's a great way to earn more experience, to buy time for Clochette's healing, and to quickly neutralize dangerous glitches.
Now that I've been making more carrots, Peeboo is almost always out of SP. When I use restorative items, Peeboo doesn't recover as many SP as the other characters. Whether I use a mushroom, an orange, grapes, or blueberries, Peeboo recovers only 5 SP.
Is this...
- because Peeboo is a natural fighter, not a magic user, or
- because I am using the Mana Catalyst reward, or
- possibly unintentional?
Now that I've been making more carrots, Peeboo is almost always out of SP. When I use restorative items, Peeboo doesn't recover as many SP as the other characters. Whether I use a mushroom, an orange, grapes, or blueberries, Peeboo recovers only 5 SP.
Is this...
- because Peeboo is a natural fighter, not a magic user, or
- because I am using the Mana Catalyst reward, or
- possibly unintentional?