Here's the former Chipettes by popular demand.

Here's the Chipmunks and their lore
https://www.furaffinity.net/view/63740992/

Brittany Miller - An impulsive, hot-headed, entitled, domineering, sassy diva. She was the lead singer of the Chipettes before they decided to just have normal jobs instead, seeing what show business was doing to the Sevilles and being burned one too many times themelves. Brittany has since become a body builder and fitness instructor. She got into fitness after her success on the football team when she was younger, especially with how it was one of the things she was better at than Alice was. Her vanity lead her into body building specifically. She still has feelings for Alice and accepts her, but she wants Alice to herself and doesn't like the idea of partaking in chipcest herself and finds the chipcest between Alice and Simon to be off-putting. Despite this, Brittany isn't a hateful person and is still friends with the Sevilles. She helped Alice with her transition in terms of fashion and such, though it didn't take much work since Alice was already pretty decent at it. She is undeniably a top, unlike Alice who is a bratty bottom.

Some History
In the 1970's they were in an orphanage in Australia despite not being Australian somehow. After they found their way to America, they formed a band, calling themselves "the Chipmunks", not knowing about Alvin and the Chipmunks. It was until their first encounter with them in 1983 that they changed their band name to "The Chipettes" and became a rival band to them. They were eventually adopted by Dave Jr.'s neighbor Beatrice Miller. Since then, the Chipettes became an unintentional accompanying act to the Chipmunks and took part in whatever they were doing for the most part.

In 2009, Beatrice Miller died of old age. Since the Chipettes were still teenagers, they were adopted by Uncle Harry who saw this as a new opportunity to make it big since his antics with the Chipmunks went up in smoke. This ultimately failed and his abuse of the Chipettes drove them to despise him as much as the Chipmunks already did. When they turned 18, they ditched him and went to college. Harry went on to become a wildly successful online conservative political activist, becoming a multi-millionaire after helping Evel Guy Landlorde win the 2016 election. Meanwhile the Chipettes had moderate success in their careers, but they find it less stressful than what they had to endure before in the entertainment industry and are amazed that the Sevilles are still at it.

They still collaborate and make appearances with the Chipmunks from time to time, finding that to be tolerable, especially with how the Sevilles run their act now. They still fucking hate Uncle Harry.

Jeanette Miller - An intelligent, compassionate, contemplative and shy lady nerd. Even after the band dissolved, she still enjoys playing piano. She became a librarian and is a member of the Communist Party of America. Despite seeming timid, she has a rebellious streak and is pretty freaky. She has difficulty standing up to Brittany though. She tends to enable Alice's rebellious behavior and freak factor and finds the chipcest between Alice and Simon to be very hot. Her studies are more focused on the humanities, while Simon's studies are more in technology, chemistry, and physics. The two of them do dabble outside of those categories as well. She, too, helps Simon with making sure Alice is doing Alice things safely, although she has difficulty being firm with Alice and tends to be ineffective at anything but encouragement.

Eleanor Miller - A sweet, clever, confident, chilled-out little nugget who loves food. She often finds herself in a similar "wrangler" role as Simon, being the one to stand up to Brittany. She now works as a chef. Much like Theodore, she too is nonbinary and asexual. She's in a romantic relationship with Theodore, the two of them preferring getting stoned together and eating a good meal together. The closest to sexual activity they do is watching their siblings go at it and cheering them on comically. What's more to love than dinner and a show?