Mort appears as stockier and taller than the majority of the students. He has orange-brown hair (sides shaved off) and peach skin, with his attire consisting of a dark navy blue shirt, light blue jeans, a white long sleeved undershirt, and red and white sneakers.
Mort is very spiritual, practicing New Age beliefs, such as knowing the properties of rose quartz, and talking about having a blocked chakra. In Going the Extra Milo, it is possible he may be a vegetarian, since he wagered his "vegan cheese sticks" to see if Milo and Zack would make it to school on time. Unlike Bradley Nicholson, he acts more civil around Milo, and treats him like a friend; he even came to Milo's birthday party. Mort and Bradley seem to be friends and are often seen together, though Bradley's condescending attitude and lack of understanding or agreement with Mort's beliefs occasionally leads to friction.
In The Undergrounders and Sunny Side Up, Bradley could be seen with Mort. Bradley often questions Mort's spiritual beliefs, arguing against Pluto being a planet, while Mort insisted on it being in his Fourth House and calling into question why Mort would need to buy so much Rose Quartz. They can be seen working together for a science lab in Sunny Side Up. While it's assumed that they're good friends, Bradley's attitude towards Mort's beliefs are the only dialogue between them, nothing supportive or seemingly friendly.
Mort first interacts with Milo in Rooting for the Enemy. Mort was told by the football team's coach that Milo could attend the game on account of facing a team they were likely to lose anyways. He also mentioned to Milo that he had a blockage in his Fourth Chakra and that would negatively affected how he played. After delivering this message, Mort fell off a cliff. Instead of blaming it on Murphy's Law, he blamed it on his Fourth Chakra. At the football game, Mort is seen as the only one who doesn't blame Milo for something happening to them while they're around Milo, instead blaming his Fourth Chakra.
The image gallery for Mort Schaeffer may be viewed here.