As a witch, Majo Ume has long reddish brown hair and brown eyes, with light blue eyeshadow. She has orange colored spherical earrings to match her crescent shaped crystal and her uniform has buttoned side pockets.
As a witch frog, her skin forest green colored and still retains five single hair strands on her forehead that appear to rotate counterclockwise like a pinwheel. Her crystal does not change shape or color.
Majo Ume is kind and always appreciates when others do nice things for her. Like many of the other residents of Witch Frog Town, she loves to party.
Some time prior to the series, Majo Ume's identity as a witch was exposed by an unknown human, causing her to transform into a Witch Frog as a result of the curse cast by the former queen's predecessor. She has since then moved to Witch Frog Town in the Witch World.
During a powerful storm in the Witch World, Majo Ume and her fellow Witch Frogs were blown through a doorway that connects the Witch World to the Human World. Landing in Onpu Segawa's office, they proceeded to have a wild party, drinking alcohol and dancing. At some point in the night, Majo Ume wandered outside the office building and found herself at Mahou-Dou. Still heavily intoxicated, she proceeded to doodle a mustache on Majo Rika's face in her sleep, then afterwords fell asleep herself in the closet.
The next morning the Ojamajos brought the remaining witch frogs that were in Onpu's office back to Mahou-Dou so they could reunite with Majo Ume. The witch frogs then refused to return to the Witch World until they got in some sightseeing of the Human World with the Ojamajos as their escorts.
The last activity for the sightseeing day, requested by Majo Ume, was to visit an amusement park. She regrets that she had turned into a witch frog before ever getting to visit one, since it's something she's always wanted to do. The girls then perform a Magical Stage, which creates a miniature wind-up amusement park. The witch frogs cast a bit of magic to shrink themselves down and hop aboard the rides while the girls turn the lever.
Sometime later, the Ojamajos take their Level 3 exam and the first door that Doremi enters takes her to Witch Frog Town. Majo Ume and the other residents invite her into one of their homes and serve her manjuu and tea. After a short while, Majo Ume asks Doremi what brought her to Witch Frog Town. Doremi realizes that she's in the middle of an exam and can't stay, so Majo Ume and the other frogs send a box of manjuu with Doremi as a souvenir.
Motto! Ojamajo Doremi
The Ojamajo girls visit Majo Ume, Majo Matsu, and Majo Take in their home with the intent of inquiring Majo Leed about the cancellation of their Patisserie exam. Majo Ume shoves a manjuu into Momoko's mouth, saying that Witch Frog Manjuu is the village's specialty and offers all of their overstock to the girls. Ume then explains that as delicious as they are, the once popular manjuu hasn't been selling lately due to customers getting tired eating them all the time.
Later at the town meeting, Majo Leed makes a prejudicial comment towards the Ojamajos due to them being Japanese humans, angering Momoko to vocally question Leed's authority status. Majo Ume tells Momoko that she's being rude to the mayor, to which Momoko told her to shut up, causing Ume and the other witch frogs to cower before Momoko's straightforwardness to confront Majo Leed.
After the town meeting, the girls sit down with Majo Ume again to discuss Majo Leed. She explains that Majo Leed brought Japanese influence to the town while building it. The girls decide to help the witch frogs by creating a new specialty sweet for the village to sell. Ume and her fellow residents offer to help the girls in creating the sweet, wanting to contribute. Upon finishing the various flavors of uiro, Ume comments that the green one resembles Take, who retorts that it just means it looks like Ume as well, Matsu adding that it's because all of the witch frogs look the same.
Ojamajo Doremi Dokkaan!
Thanks to Majo Rika, all of the residents of Witch Frog Town have become addicted to samba, as the girls discover when they stop by the village for a visit. Majo Ume invites the girls to dance with them, prompting Onpu to accept and use magic to turn herself and the other girls into samba dancers and join in.
On the way to visit the queen in the Witch World, Majo Rika asks the girls to take a detour and stop by Witch Frog Town to see Majo Ume, who has been mysteriously depressed ever since she came back from picking flowers in a nearby forest a week prior. Ume laments that she can't go back to her true form ever again and it was all hopeless. After several futile attempts to cheer her up, Rika decides to take Ume back to the Human World, thinking a change of scenery may help her.
The next morning, Lala attempted to get Majo Ume out of hiding to come have breakfast her, Rika, and Baba, but refused because she was afraid of white elephants. By the afternoon, Rika became mysteriously depressed just like Ume, and shook with fear when Hana and Pao entered the room. Pao happily tells Hana to play the accordion, and as they play music and dance with laughter, strange black blobs are forced out of Rika and Ume's heads, causing them to fall unconscious. Pao sucks up the black masses into her truck and Rika and Ume both regain consciousness. Ume is confused on why she is at the Mahou-Dou, as she has no recollection of anything that happened since she went to pick flowers in the forest a week prior. With her depression cured, Majo Ume returned to her home in Witch Frog Town.
After Majo Tourbillon was awakened from her millennium-long slumber, she lifted the Curse of Witch Frogs, reverting all witches who fell victim to the curse, including Majo Ume, back to their true forms.