The initial rosters upon MUX launch are as follows. Active membership denotes characters who are regularly contributing members of the given team, whereas reserve membership denotes inactive or standby status. Nearly all of these characters are admin run only, and may not be applied for.
- Active: *Bald Eagle, Canadian Spirit, Captain Meteor, Civic Defender, Ember, Fleur De Lis, Gold Lightning, Liberty's Angel
- Reserve: Codex, Gemma Stone, Marshal Psyche
- Active: Airman II, Black Mamba, *Fusion
- Reserve: Brass Ring (Currently MIA), Ebb Tide, Lady Locomotive (Retired)
- *Denotes team leader