Octavia

Ottie is one of the turtle's friends who can act as the eyes and ears on the surface. She is also Sonya's best friend and the reason why the turtles come to know her. On the surface, she looks like any human would, having several insecurities herself  - one being of her body - but hides a horned, winged creature inside her human facade.

Background
Octavia Goodwin was born to unknown parents. Her parents had abandoned her before Octavia was able to keep her eyes open for too long. Newly weds Hector Rivas and Gabriela Goodwin found her during their honeymoon. Instead of taking the girl to police or child services to continue their vacation, they took care her. Due to Octavia not being human and Octavia's unknown abilities, they had a long time to figure out she was able to change her appearance. By the end of their busy honeymoon, they took Octavia to child services. After some time, the couple adopted her as their new daughter.`

Throughout her childhood, Octavia struggled with her human form. Because of this, her mother left her job and became a stay-at-home mom to homeschool her. While exploring the city one Friday night, Octavia met Michelangelo, the youngest of four mutant turtle brothers. With his help, she was able to control her body better. Through him, Octavia met his older brothers; Leonardo, Donatello, and Raphael. Although she was delighted to meet others who were appeared different like herself, she kept them as a secret from her parents, out of fear of being told not to spend time with them.

At 14, Octavia was allowed to enroll into a public school, where she met Tod Anderson, the only one who had accepted her as is at the time, but would later be her bully when he would lose his mother. While on a school trip to Abbot Industries that year, Octavia met Juno Abbot, the founder and CEO of the company. Both became well-acquainted, due to their shared interest of lifeforms that most weren't familiar with. After a few months the same year, after becoming good friends with Juno, Octavia introduced Juno to the turtles, after presenting herself in her true form. One night that same week, Octavia came upon an underground facility. After sneaking through the hidden site, Octavia spotted a reptile mutant in an arena-like setting. Octavia watched as this mystery figure fought with humans, nearly killing them before the match ended. It took nearly two months of planning to figure out a way to help the new-found mutant.

Personality
Because Octavia grew up knowing she wasn't human, she grew up with intense fears and insecurities. Octavia feared not being accepted by the humans around her, mainly because she wasn't human herself. She didn't worry so much when she met the turtles, but still feared being rejected. Octavia was insecure about her body, due to being unable to control the weight of either forms. In her true form, she was tall and slim, which allowed her to be fast and agile. She wasn't strong, though. In her human form, however, Octavia was strong but seemingly overweight. Due to this, she grew greatly insecure about her body.

Even though Octavia didn't have much friends, she was nearly overprotective of the ones she has as she would fear losing them. Since Mickey was her very first friend outside her family and school, she was the most protective of him. Octavia was nearly the same with the other turtles.

While Octavia seems bearing with being protective, she's kind to those around her, even to Tod, once a friend who turned on her and became her bully. Octavia would be the listener to all and allow those frustrated to vent on her. She would, however, go hunt those she feels are threatening to those she cares about and will not stop at any cost, unless needed.

Trivia

 * Octavia serves as somewhat of a representation to the series's creator.
 * Both Octavia and the creator have insecurities about their bodies and fear of losing someone and being rejected by those around them​.
 * Both feel out-of-place in their families.
 * Octavia plays a major role in a possible spin-off.
 * Octavia is musically inclined.
 * This and her name is a reference to Octavia, a music-based unlockable player character in free-to-play MMORPG Warframe.
 * She is a fan of science-fiction, serial killer documentaries, and horror.
 * The Creeper from Jeepers Creepers is a heavy inspiration of Octavia's true form, the only exception being of Octavia's gaping mouth and horns
 * He may make an appearance, or at least be mentioned, in the series.
 * Scarlet from Silent Hill: Homecoming inspired Octavia's figure and mouth in her true form
 * YouTuber LoeyLane and Red Shoes/Snow White from Red Shoes and the Seven Dwarves inspired Octavia's human form.
 * It is unknown what happened to Octavia's species or her parents, this may make her the last of her kind.
 * Her species are likely able to have a large number of offsprings in one birth, similar to cats and dogs, as she has a large number of children in the possible spin-off.
 * Because The Creeper may make a cameo in some way, it may be possible that he is her father. However, it's unknown how, since he has no visible genitalia in Jeepers Creepers 2.
 * Octavia is prone to violence.
 * Much like Raphael in the original Mirage comics, Octavia will likely not remember what happens during her episodes.