Mishka is Linka's older brother. He still lives in their hometown, presumably taking care of their grandmother. Wheeler's initially jealous of Mishka, thinking that he's Linka's boyfriend or something, but later learns that Linka and Mishka are actually siblings, meaning that Mishka poses no romantic threat to Wheeler.
Mishka's height appears to change several times. Sometimes he towers over Linka and she only reaches his shoulder - other times they appear to be of equal height. He has shoulder-length blond hair. His eyes change from brown to blue.
Mishka wears a green jacket over a white shirt and blue jeans.
- Mishka is actually a Russian word for "teddy bear".