Each Giga Pet plus offers multiple pets / characters.  The middle button on them all is a light.  They all have really nice graphics and sound.  Supposedly they also respond to voice.
Looney Tunes
6 characters. Keep as many happy as you  can!
Small Soldiers
Keep as many as you want also.
Giga Circus
Another one where you can choose as many as you want to keep happy.
Giga Farm
Chose from 4 pets and three crops.

Giga Pound
Has 8 dogs
Another multiple choice to keep as many happy as you want.