Sarah

"No one messes with my best friend and gets away with it!"

- Sarah, making a promise to protect Zac Sarah is the deuteragonist of the TV show Mushroom Guard, and a member of the titular group.

Childhood
When a young Sarah transferred to a new school, she noticed a boy named Zac being tormented by bullies. After helping Zac stand up to the bullies, the two of them became best friends.

Peace with the Koopas
Sarah and Zac were invited to a kart racing championship in the Mushroom Kingdom, alongside the Koopa Troop. After the championship ended, Bowser vowed to stop attacking the Mushroom Kingdom, a vow which would last for exactly 1 year before being broken...

Establishing the Mushroom Guard
Sarah became a part of the newly-formed Mushroom Guard when she helped the Mario Bros capture a newly-emerged villain in "Heroic Beginnings, Part 2."

Personality and traits
Sarah's greatest desire is to bring justice to the world.

Compared to her friend Zac, Sarah is somewhat more outgoing.

Overall, Sarah is a friendly person who cares deeply for her allies, however she can come off as overly competitive at times.

TBA

Allies
Sarah and Zac are best friends and they spend a lot of time together. In various episodes, they can be seen fighting side by side. The two Inklings are rivals in Turf War, but they work together at other times. Sarah is highly protective of Zac, and won't hesitate to rush to his aid.

Sarah is inspired by Mario and Luigi's tales of heroism, and she appreciates their leadership. She also holds great respect for Daisy, and gets along well with Berry and Gold (despite sometimes finding their antics to be immature).

Although Sarah can be put off by Agent 3's aloof and arrogant nature, she considers Agent 3 as a friend.

Sarah shows respect to Princess Peach, and she gets along with Toadette.

Enemies
Although Sarah opposes Bowser and the Koopa Troop, she sees many of them as worthy opponents, acknowledging their great strength in several episodes.

Sarah is noticeably fearful of Dr. Hex and her magical abilities. She resolves to train and get stronger, so that she can protect herself and her friends from Dr. Hex.

Trivia

 * Sarah can be considered as a counterpart to Stealth Elf from Skylanders Academy: Sarah's friendship with Zac mirrors Stealth Elf's friendship with Spyro.