The principal cast consists of Matthew Mercer, Ashley Johnson, Travis Willingham, Laura Bailey, Liam O'Brien, Taliesin Jaffe, Marisha Ray, Orion Acaba and Sam Riegel.
Campaign 3 also has characters crossing over from the spinoff anthology series Exandria Unlimited (ExU); with Johnson starring as Fearne Calloway, and O'Brien as Orym of the Air Ashari.
Johnson's Campaign 2 character is Yasha Nydoorin, an aasimar barbarian who is exiled from her homeland in Xhorhas for marrying outside the strict arranged-marriage traditions of her clan.
[9] Campaign 3 sees Johnson reprise her Exandria Unlimited character Fearne Calloway, Ruidusborn faun[i] druid who travelled to the Material Plane from the Feywild to explore and find her parents.
[8] In the Search for Grog and the Search for Bob one-shot specials, Willingham plays Sir Bertrand Bell, a human fighter who travels with Vox Machina to the plane of Pandemonium in 812 PD Campaign 2 sees Willingham play Fjord Stone, a half-orc warlock who unwittingly makes a pact with a malevolent leviathan named Uk'otoa when he is drowning at sea.
After a period of self-discovery, Fjord breaks his pact with Uk'otoa and becomes a follower of the wilderness goddess Wildmother, who also has dominion over the sea, and multiclasses into a paladin.
Bailey's Campaign 1 character is Vex'ahlia "Vex" de Rolo (née Vessar),[h] a half-elf ranger who multiclasses in to rogue.
Her relationship with the Traveler is temporarily strained when she learns he is not actually a deity as originally claimed, but an archfey named Artagan, a recurring NPC from Campaign 1.
[16][17] In Campaign 3 Bailey plays Imogen Temult, a Ruidusborn human sorcerer with psionic magic who has reoccurring dreams of a red storm.
Liliana, as a general in the Ruby Vanguard, is working with the powerful elven archmage Ludinus Da'leth toward mysterious ends involving Ruidus.
[m] Early in Campaign 2, Jaffe plays Mollymauk "Molly" Tealeaf; a tiefling blood hunter and con artist working in a traveling circus.
After Molly's death, Jaffe plays Caduceus Clay, a firbolg cleric in service of the Wildmother, goddess of the wilderness.
The Mighty Nein recruits Caduceus before the party's second attempt to rescue their captured members; he remains with the group because he believes it will aid in his journey.
In the Mighty Nein Reunited two-part special, Jaffe plays Kingsley Tealeaf; a tiefling blood hunter with levels in rogue.
[20] Beau is initially presented as being resentful of authority and anti-social, and rises to the rank of Expositor to carry out sensitive, covert investigations.
Laudna was killed by Otohan Thull of the Ruby Vanguard during a battle at the Paragon's Call fortress which led the Bells Hells to go on a successful quest to magically resurrect her.
Campaign 2 sees Riegel play Nott the Brave, a goblin rogue who escaped jail with Caleb and wishes to support his growing magical potential.
She is returned to her halfling body in episode 97 and struggles with her conflicting desires to continue adventuring with the Mighty Nein, and to stay with her husband and child.
In Campaign 3 Riegel plays Fresh Cut Grass,[n] an automaton[q] cleric with ancient Aeorian design who was reassembled by the tinkerer Dancer in 838 PD.
They initially believe that they were built by Dancer but the party learns FCG was a pre-Divergence Harmonious Aeormaton named Faithful Care-Giver.
Guest players are an irregular occurrence on Critical Role and, in most cases, only stay on the show for a one-off appearance or a few consecutive episodes.