|High School Student|
| Middleton High School|
|No Known Relatives|
|No Known Love Interests|
|No Known Pets|
|No Known Nemesis|
|Behind the Scenes|
|"Attack of the Killer Bebes"|
Marcella is one of several cheerleaders at Middleton High School. She has appeared in all seasons, but usually, only with the other cheerleaders. She is often seen either directly next to, or counterpoint, to Liz, even when they are not in routines, indicating that Liz may be her closest friend on the squad.
- Her name was mentioned when she once went missing with Liz.
- Aside from a wordless scream, Marcella has not had a solo speaking role.
- Due to their strong resemblance, many people have mistaken Marcella and fellow cheerleader, Hope, for sisters, or at least related in some way, but they are not related. A couple of ways to tell Marcella apart from Hope is that Marcella has a slightly darker skin tone than Hope does, and Marcella has a mole by her lip. "M" for "mole" and "Marcella" makes it easy to remember which is which.
- When not in her cheer outfit, Marcella normally wears a burnt orange long-sleeved shirt, slightly darker pants, and brown shoes.
- A couple who—although not stated or implied—appear as if they could be Marcella's parents.
- The woman could easily be Marcella's mother—or at least a close relative—as she looks identical to Marcella, just slightly older. The man with her is often seen at the background, among other places, in and around Middleton High School, and is sometimes seen with a small boy who could Marcella's brother. His tracksuit may indicate he may also have a coaching position in addition to what Barkin does.