Characters - Main Heroes
The main characters of the cells are listed and described here.

Erlona
An albino neutrophil.
Erlona is first seen as a teenage cadet, but is later leveled up to the officer rank as she matures. She loves her job.
She's serious, yet can be reckless at times, especially in situations which makes her a bit nervous. Maybe she'll learn how to keep her head cool one day.
Erlona hates SARS-CoV-2 and wants to beat it as soon as possible in order to protect Murray, her human. She can't stand the fact that the virus knows the tricks to outsmart her and the other cells.

Earl
An alveolar macrophage.
When witnessing King Matthias killing an another macrophage, Earl seems scared to death of him, but shows courage once he has processed the whole event and given it a place.
He joins the battle against the virus after he gets activated.
Earl is good with everyone, except for Jarred. Picture shows him in activated form.

Mitzi
A red blood cell.
She's the happy-go-lucky one of the bunch, at least... until she too learns that SARS-CoV-2 can kill Murray. She mostly just does her job as a red blood cell, otherwise she's probably hanging out somewhere with Prince Meech, the only friendly SARS-CoV-2 virion whom she befriended (it's actually the other way around, Meech managed to befriend her). She has congenital anosmia, which is the very reason why she's the only cell who doesn't seem to be bothered by Meech's rotting smell. She can't smell anything.

Eliza
A cytotoxic T-cell.
Eliza is a well-respected cell within the community. She can often be seen doing patrols, but whenever she's not on a patrol, she's somewhere teaching kid cells about their future functions. Being a specialized virus killer type cell, Eliza is one of the more dangerous and challenging opponents to SARS-CoV-2. She's a really good fighter!
Eliza is trans-female and she's married to Tiffany, a female neutrophil. Picture shows her in activated form.

Jarred
A neutrophil and leader of the immune cells of the blood.
Jarred is a kind guy who has his heart at the right place, but is often too proud. He's ever only seen weak cold coronaviruses, so he firmly believes that this novel coronavirus is weak and easy to defeat too, so he only sends a few of his people to aid in the battle against it. Much to the annoyance of Earl, who wants more neutrophils to join the fight, than only a pawful. Hopefully, Jarred will take the situation more serious soon.

Marshall
A dendritic cell and leader of the immune cells of both the interstitium and lymphatic system.
A calm cell who takes the situation more serious than Jarred. He and his team join the fight against SARS-CoV-2 once he learns that King Matthias is taking his neighbors hostage and telepathically controlling them. Marshall eventually recruits the cells of the lymphatic system too, which means more manpower on their side. But will he be able to free the cells that are being controlled by the virus?
Picture shows him in activated form