I've been looking at examples of Amination VO reels, as it's somethign I really want to get into. (Not to mention I spend so much of my life putting funny voices on and imitating birds and things that I think it could be really fun!) Here are seom examples of what i've found so far. Really like this one! She's got a vast array of voices and you get a really strong sense of character from each separate voice.
This one also seems really fun, with a big selection. I like what she did with the opera singing, and might steal that idea to add to mine! She also uses plenty of background sound effects, which I may or may not do in my own reel.
I like the variety added by playing with different accents In this third video too!