Mr. Block has pale pink skin and dark black curly hair. His eyes are light blue and accented with puffy pink lower eyelids. He wears a black tunic that has a straight collar with red tabs, red cuffs and red piping at the shoulders.
He also has a silver braid over his left shoulder that ends at his upper left chest with a yellow oval devise which has a red knob. It has not been revealed if this devise is a badge of office or a piece of equipment.
Mr. Block conducts himself as though he hates everything. He is rude and condescending to everyone he has been observed interacting with thus far.
His only enjoyment seems to be insulting Vinnie and Balthazar.
In Time Out he is briefly shown telling Dakota and Cavendish to get back on pistachio duty.
In Missing Milo he is taken hostage by the pistachions after Dakota and Cavendish succeeded in saving a pistachio plant. His memory of the timeline is erased when the plant is destroyed in Milo's time, leading him to yell at the pair to get back on pistachio duty.
The image gallery for "Mr. Block" may be viewed here.
Mr. Block is one of only seven characters in season 1 who's eyes have pupils.