Hi, Christine!
As the mom of one girl and one boy, I completely understand your desire for character dining that's boy-oriented. One restaurant that we've found fits the bill is
'Ohana, at Disney's Polynesian Resort. If you head there for breakfast, you can try 'Ohana's Best Friends Breakfast with Lilo & Stitch, a real hit with our entire family.
We've also enjoyed a wonderful meal at
The Garden Grill, adjacent to Epcot's Living with the Land attraction. You'll enjoy delicious family-style fare and will get to meet Chip 'n Dale, along with Mickey and Pluto (of course, characters are subject to change, but we've always met Chip 'n Dale here...)
If your boys are little, Disney Junior Friends can be met for breakfast and lunch at
Hollywood & Vine, at Disney's Hollywood Studios, where Handy Manny Special Agent Oso make appearances each day.
Supercalifragilistic Breakfast at 1900 Park Fare, located at Disney's Grand Floridian Resort & Spa, may be a serious consideration, too. We dined with our dear friends (four children all together) and laughed so hard we cried at the antics of The Mad Hatter, along with Mary Poppins and Alice in Wonderland. The combination was hilarious!
Chef Mickey's (Mickey and Pals) and The Crystal Palace (Pooh & Friends) are still always a hit with our family, as the food is quick, delicious and plentiful and the company is always, well, special!
Send more questions as you think of them; I love to help!