Morty plays Keth Silverson, a half-orc rogue. This makes him the sneaky member of the party, most adept at scouting ahead, disarming traps, picking locks, and attacking from the shadows with his pair of daggers. As a half-orc, he's particularly intimidating, despite the character's seemingly short stature. Like any typical rogue, he seems to have a penchant for stealing, as he wrote under "ideals" and "bonds": "What's mine is yours and what's yours is mine. You know what? What's mine is actually just mine." Like Morty, Keth is easily swayed by mad scientists — despite his trust issues.
Morty's sister, Summer, plays the half-elf ranger Ari Strongbow, who's useful for tracking and surviving in the wilderness. Apparently Ari followed through on the destiny given to her by her last name, as she wields a longbow in battle. Summer mined her own backstory; her character also has a dead brother, and Ari is looking for vengeance. As a ranger, she has limited spells, including the ever-important Cure Wounds, which can take some pressure off the party's cleric.
Which brings us to Beth's character, the wood elf cleric Lyan Amaranthia. As a cleric, she gains her power from the god she's devoted to and specializes in healing, killing the undead, and hitting people with her warhammer. If one of the other characters dies, it's on Beth to revive them. Like any roleplayer, and as possibly the most disturbed character on the show, Beth seems to have injected some of her own trauma into Lyan, whose personality trait states: "Once abandoned yourself, you would never abandon someone who needs your help." Ummm, roleplaying is supposed to help you escape your real life ...
Finally, Beth's husband Jerry plays the party's wizard, a half-elf named Kiir Bravian. As a wizard, he is incredibly smart, gains all his magical abilities from studying books, and can play either supportive or hard-hitting. Jerry's character specializes in Abjuration magic, which focuses on protection. According to his character sheet, he's finally courageous enough to fight for his friends and family, but is doomed to lose everything he loves no matter how hard he tries. Turns out even in D&D, he's a loser.
Considering Rick's hatred for Jerry, it'd be a surprise if Kiir got anything he wants.