Feebee

Feebee Jeffy Mario Wilfred(or simply Feebee) is one of the main characters in the SuperJeffyJhacir series, She is the youngest and identical twin sister of Jeffy debuting in Jeffy’s sister! later on she was killed in a bike accident three years before her mother, Nancy abandoned her brother Jeffy at the apartment complex where Mario and Bowser lived in, She was later revived by Cody in Jeffy’s big surprise where Jeffy was really upset about his sister being dead. she is oldest adoptive daughter of Luigi and Daisy, the younger cousin of Elizabeth and the older cousin of Chloe, The oldest sister of Lucas.

Feebee didn’t have a personality until Jeffy’s big wish where not only she’s dumb but a nice, friendly helpful person and cares about her parents and younger brother.

The things she does in her everyday is hanging out with Luigi and Daisy, playing toys with her baby brother Lucas.

Early Life
Feebee was born on August 21, 2004 and became the 2nd child to world famous painter Jacques Pierre Francois and Nancy along with her twin brother, Jeffy. Eventually, Jacques couldn't handle Nancy's abusive behavior and left the family, but made sure to include Jeffy and Feebee in his will. The two of them stayed and grew up with Nancy. For some reason, they always wore helmets in the house, likely as protection from Nancy's abuse.

Death
In Jeffy Sister Returns!, it was revealed what happened to her.

Three years before Nancy abandoned him at the apartment complex, Jeffy and Feebee wanted to learn how to ride bikes, but Nancy refused, telling them to teach each other. Before they left, Nancy demanded Feebee's helmet to use as an ashtray.

The two went outside, though Jeffy was now reluctant, given that Feebee didn't have a helmet anymore, but Feebee encouraged him and asked if he would give her a push on her bike. Jeffy obliged pushed her down the street and after she asked him to, he let go of the bike.

Unfortunately, he let her ride onto a busy road, and despite screaming at her to stop, Feebee couldn't (as she didn't know how to use the brakes) and was hit by a GMC Sierra with an unknown driver (often presumed to be Woody due to to Woody's car also confirmed to be a GMC Sierra), killing her instantly. This horrified Jeffy who begged her to wake up but she wouldn't, causing him to scream for Nancy. Afterwards, Brooklyn T. Guy was alerted to the incident (either as a doctor or officer) and declared her deceased, a concept Jeffy couldn't understand at the time.

Aftermath
This incident traumatized Jeffy, who, believing that wearing a helmet could have saved her, causing him to decide to always wear his helmet no matter what.

For the next 5 years, or at least 2 after he was abandoned, Jeffy continued to dream about Feebee, that she had also been abandoned alongside him, but after a rather violent dro, his new adoptive father, Mario, decided to get a doctor to check up on Jeffy, believing Feebee to be in Jeffy's imagination.

However, the doctor turned out to be Brooklyn Guy, who confirmed to Mario that Feebee had been real at one point. After kicking Brooklyn Guy out and questioning Jeffy about her, he recalled what happened to his sister to Mario. Afterwards, he told Mario that he believed Feebee wanted to be a tree, due to her being buried in the ground, saddening them both.

It is likely that Mario later explained to Jeffy that Feebee was dead, and that Jeffy was able to accept what happened to his sister and moved on, given that he hasn't dreamed about her since until years later where Jeffy had flashbacks of the terrifying incident and was really sad about it and started blaming himself for it until Cody brought her back to life with his magic wand which made Mario act crazy but thankfully Mario’s twin brother Luigi and his wife and nephew lived with him and gave feebee to Luigi and Luigi and Daisy loved feebee so much that they officially adopted her as their daughter and now feebee is Luigi and Daisy’s adopted daughter