Chef Mickey (Contemporary)
Garden Grill (Epcot)
Tusker House (Animal Kingdom)
Hollywood and Vine (Hollywood Studios - dinner only, but think lunch too starting in Sept.?)
'Ohana (Polynesian - breakfast only)
Mickey's Backyard BBQ (Fort Wilderness)
Our family favorites are Tusker House and Garden Grill. If he's a little apprehensive, Garden Grill might be a good choice, because it's a more mellow environment. They also bring the food, family-style, to your table, which is always easier with kids.
You can also meet him at each of the four parks:
MK - Town Square Theater (FP+ available - and he talks until May)
Epcot - Character Spot (FP+ available)
AK - Adventurers Outpost (FP+ available)
DHS - Across from the Sci-Fi Dine-In Theater restaurant (no FP+)