So far I haven't noticed any interactions, but he's got some neat idle animations.
Adjusts his glasses
Throws down a force field shield and stands in it
Holds and charges up an electric weapon
And last but not least, he enrages and grows larger with glowing eyes and fists
Oh and throws out a few swipes and swings too
He's only got one tooth, which I guess is appropriate for a little baby. Still teething! D'aaaww. :)