Luxo Jr. is the desk lamp that is in the Pixar logo -- he "hops" out at the start of Pixar films. There is an animatronic Luxo that does a little "show" at the Studios every evening.
The
"Up" characters are ... well ... the characters from the move "Up", which is Pixar's most recent film. They are available to meet & greet at the Animation building at the Studios.
The Studios also has a whole
"Pixar Place" area with shops and the Toy Story Mania ride and some fun photo ops. You can often find the Green Army Men from Toy Story hanging out there.
The Studios also presents
"Block Party Bash" every day, which is a parade / street party that includes a lot of the Pixar characters -- Incredibles, Toy Story, Monsters Inc, etc.
At Animal Kingdom, there is a
Findng Nemo show.
You can also see Nemo at
The Seas with Nemo and Friends at Epcot. No meet & greets, though.
At Epcot, you can also chat with Crush at
"Turtle Talk with Crush", also in the Seas pavilion.
The Magic Kingdom has
Monsters, Inc. Laugh Floor, which is a family-friendly improv comedy show in Tomorrowland.
