Frankie Stein

Frankie Stein, also known as Frankie, Frank Jr, Juliette or Frankella is a character introduced in SHTM; The Return, and later appears in various ones after that. She was a former student as Monster High (class of 2016) and is currently taking courses of becoming someone in an electrical field. She is the daughter of Frankenstein's Monster, hence her appearance at the rehab center.
Backstory
Frankie Stein wasn't always a living undead corpse, she was once a bubbly, polite and outgoing girl in the 70's known as Frankella Evans. Those who knew her said she was very shy and nervous, but when you really knew her, she is the most mature person you'll ever meet. Her friends described her as funny, polite, cheerful, shy and hard-working. Frankella had a condition called heterochromia (two different eye colors), which made one eye blue, and the other green. Bullies at school used to make fun of her because of her odd colored eyes, but her friends were totally cool with it, and said "It made her unique. Frankie wasn't y'know...Frankie if she didn't have her heterochromia."
In High School, she made new friends, and Frankella was extremely interested in pursuing a career where she could work with electrical things. But her condition grew to attention of bullies who would call her a freak and "bug eyes". However, Frankella would ignore these rude comments and go about her day. But one rainy afternoon when Frankella was heading home from school, the bullying went way too far. Her bullies kicked the books she was holding out of her grasp and pushed her down a sewer grate on the street she was walking on. The bullies then closed the lid to the grate, and Frankella later died from starvation and dehydration. Her friends hated the bullies from then on, even as adults. Almost everyone at the high school she went to attended her funeral, and she was long gone and forgotten- well- that was until the lab intervened. 
With the success of Dr. Victor Frankenstein bringing life into something that is dead, Frankenstein's Monster had asked for a wife. It was decades that the Bride of Frankenstein was created that the monster asked his creator if he could have a daughter, to have a full family of monsters like him. The doctor thought about it for a good moment, and agreed. He dug up the youngest dead body there was (youngest meaning died at a young age, as for Frankie, she died at the age of 17, her junior year), and electrified it, the same way he made his monster and his bride. A bit of cables here, some bolts there, and Frankenstein's Monster had officially been given a daughter. He named her Frankie (since her name was Frankella, also a pun on the word "Frankenstein". At first, Frankie, like her father, had abnormal thinking, and couldn't speak, only groan. But, with the help of the expertise from her creator, Frankie was speaking words and full sentences. Dr. Victor Frankenstein then showcased his latest creation, Frankenstein's Daughter (Frankie) to a local theatre, performing "Puttin' on The Ritz" (a Young Frankenstein reference). With the success of Frankie capable of dancing, speaking and singing, the scientist was amazed by his work, and the monster was just happy that he had a daughter. It seemed that everyday brought new wonders to Frankie, her being fascinated by rain (as said in her diary), going out in public, and meeting new friends. She had met Draculaura and Clawdeen Wolf at the Maul, and the three have been inseparable ever since. The three then enrolled into Monster High, and through 4 years of toil and trouble (no witch pun intended), graduated in 2016. Frankie, along with others are now enrolling in Monster College, where she can finally finish her studies in electrical work, and be what she's always wanted to be since she was alive; an electrical worker.