Take a look a the boy with the baseball cap with the teens playing Ping-Pong in the first issue of Here's Negan. Then compare it with the way Glenn is drawn later in the Walking Dead comic series - #100 before Negan kills Glenn, a few pages before when he is kneeling. Coincidence?
Yeah I do agree if you look at the way Glenn is drawn in the early comics, he does look more Asian, but as time goes on near #100, he looks less Asian and wears a cap like this kid. Perhaps Glenn was a student in the same school Negan taught (but doubtful as Glenn was in Atlanta and Negan probably near Virginia) I'm sure it's not possible, but was curious if this was a sneaky trick from our beloved writers and artists of this series.