We are getting VERY excited too. You've already received some great input on the character breakfast stuff. But I thought I would give a little more...
So at Storytellers Café it is a "Critter Breakfast" you will likely see Chip, Dale, Meeko, the two bears from Brother Bear. (They may also have Brer Fox or Brer Bear). They also have a park ranger that walks around and provides some games and interaction with the younger guests. The Breakfast is more low key and relaxed. The presentation is a little more classy then the Surf's up Breakfast. When me and my sister went last November it wasn't terribly busy and I swear Meeko and Chip visited our table 3 or 4 times. Meeko even stole my sisters phone and started taking selfies. It was very fun.
At the PCH Grill they have the "Surf's-Up with Mickey" Breakfast. Here you will likely see Mickey, Minnie, Donald, Daisy and Stich. You could see Pluto but you won't see Chip or Dale and I'm pretty sure you won't see Goofy (although he has been there before). They are all wearing Beach clothing. It is a fun breakfast. It is a little more bold and bright with the look and feel of the restaurant (louder music, etc.)
Goofy's Kitchen is the "Original" Character breakfast at
Disneyland, found at the Disneyland Hotel. Here you will always get Goofy, Minnie, Pluto, Chip, and Dale. You will get additional Bruch items and desserts that you won't find elsewhere.
Breakfast with Minnie at Disneyland at the Plaza Inn will likely get you the most characters. Often I've heard people seeing 7 or 8. Usually Minnie, Pooh and Friends, plus some classic characters like the fairy Godmother, Hook, Peter Pan, etc.
Last option... There is a Princess Breakfast over at California Adventure. People usually have pictures with 5 different princess there.
All of the Character Breakfasts have the classic Breakfast items like waffles, eggs, and bacon. But each one will have there own additional items. I think Surfs up has some fruit smoothies, goofy has peanut butter and jelly pizza and lots of desserts, etc.