Main Lineup:
Toriel: She turned down the offer for team captain. Her reason? "Other girls wanted it more". When Toriel does have an opinion on something, everyone else is polite enough to listen. The heart and soul of the team. Bakes celebratory pie after every victory, and consolation pie after every defeat.
Roxy: She became captain because she demanded it. Luckily she's good at the game, so no-one aside from Judy has a problem with it. Her strategies and pep talks usually boil down to "kick their asses" and "hit the ball". Easily the most competitive member.
Judy Hopps: Despite not being team captain, she ends up giving better pep talks and strategies than Roxy does. Roxy HATES this fact, but Hopps plays very well despite her size. Competitive, but unlike her rival, she's subtle about it.
Lola Bunny: She was the one who rallied the other girls to the volleyball tournament in the first place. She's often considered "the famous one" by onlookers, but the other girls know that she's more than that.
Lucario and Renamon: They started as rivals, but now they're best friends. Both have almost flawless chemistry on the court, and as such always play side by side. They even hang out on weekends.