Curtis

Curtis is an original character and minor character.

Pre-Apocalypse
Nothing is known about Curtis's life before the outbreak.

Post-Apocalypse
At some point during the apocalypse, Curtis joined the Constantine Safe-Zone.

Between the Cracks
Curtis first appears admiring Matt's crowbar arm, which causes Frank to tell Matt he gets too excited sometimes. Frank then tells Curtis to get some medical supplies and is surprised when he comes back without one of the supplies, but shrugs it off.

Killed Victims

 * Possibly numerous counts of beasties

Frank
Curtis appears to have a cooperative relationship with Frank, although he gets annoyed when Frank says he gets too excited.

Matthias "Matt" Harris
Upon their first encounter, Curtis is quickly interested in Matt's crowbar arm, but nothing has progressed beyond that.

Trivia

 * It is hinted that Curtis has some kind of mental disability when Frank says he gets too excited.
 * He is the second Asian character to appear in the series, only after Eve.
 * However, he is the first male Asian to appear.