Here is my bio for Pinkfire. Please keep in mind that I am currently re-watching the series, after not having seen it in years so please correct me if anything is inconsistent, incorrect, or not canonically possible (: I have read some articles in the wiki to help me, but I am very open to critique & helping me to fix.
Name: Pinkfire
Nickname(s): Princess Pinkfire
Age: 19
Species: Pegasus
Gender: Girl
Home: A small amount of floating pink clouds drifting through the sky. She has a shelter up there, and doesn't leave often
Personality: Childlike, absent-minded, friendly, naive, blunt, idealistic
Likes: New people, stuffed animals, dolls, food, sleeping, makeup, jewelry, sleeping, fairy tales, music, art
Dislikes: The color blue, loud noises, being under pressure, being told what to do, mean-spirited people
Hobbies: Collecting cute things she likes and bringing them back to her home to decorate, painting, writing stories, travelling
Backstory
Pinkfire is a pegasus that has been on her own as a young child. She was flying with her parents when she got lost during a storm and passed out, when she awoke she was on a small cloud, terrified and alone. A flying object in the sky, during the storm, hit her head, which caused her to lose memory of her parents, never even thinking to have any at all, so the lack of never bothered her or made her sad. The cloud that she was on floated seemingly nowhere and out of her control, and she only quickly left it to obtain food and would hurriedly rush back. She was isolated for a while, until she saw some ponies from below, but she was too scared to venture down and approach them. However, she needed to eat, so she would wait until other ponies were either out of sight, or asleep before swooping down, grabbing some food, taking a bath, whatever she needed to do, and then run back up to her cloud, where it was safe. One day on one of her trips down to the surface, she caught a small pink doll from the corner of her eye, and she was so drawn to it that she grabbed it and went home. The pink toy sparkled a feeling of warmth inside her that she'd never felt before, almost like it was a puzzle piece that filled the void inside her.
Ever since then, she has been collecting and stealing any pink thing she could find, bringing it up to her cloud. As she got older, she built a small cottage for herself, though it still lacks a lot of things a living creature would need to sustain life (like, a kitchen for cooking). She has cabinets where she keeps canned food and hay, but she does not know how to cook, as she never had the means and thus never learned - so this is still her primary reason for visiting the surface to this day, in addition to finding and taking random pink things. Now she is 19, still not having interacted with another pony since her parents that she does not recall, but she does know how to read and enjoys doing so, talking with the various pink objects and reading stories from books aloud to herself. However, most of the books are fictional, or fairy tales and so her perception of reality is warped, or incorrect. When she lost her memory, she was old enough to be able to speak and I've decided that she still retained that knowledge. However she often mispronounces words, since she's never heard some of them (in roleplay, I will italicize and misspell a word to show she pronounced it wrong).
Biography
Because of her isolation since a young age, she still mentally can be viewed as filly-like. She does not know of her own age, never kept track, and hasn't celebrated a birthday since the accident. To her, she is "normal" and nothing is wrong with this. Though she has a general sense of "right" and "wrong", she believes certain rules do not apply to her, because in her mind she is a self-proclaimed princess. With all the stories she's read, she tries her best to behave with grace and charm, but her lack of real interaction with real ponies makes that sometimes difficult. When she will get scolded (I'm speaking in terms of the roleplay, if this ever occurs) it's like a slap of reality in her face, she'll often think, "This isn't like the books!" and be very, genuinely confused. She is fairly innocent and stunted, and it is my hope for her in the RP that she is able to grow into a functioning member of Equestria.
Appearance
Below is her default outfit (I didn't make her a pegasus at the time of drawing this so disregard the lack of wings. She has wings now,
but she's collected a variety of outfits and accessories along the way.
Due to her not being able to voluntarily control where the cloud-home is going, I'd imagine she could pretty much stumble across the setting of the roleplay. And to integrate, like I said, she could be making her trip to the surface to steal food or pink things, and perhaps get stuck down there and lose sight of her home. Her goal would be able to find it again, but that's just my idea! However I am open to many others Since she is prone to taking things that aren't hers, I think a good idea might be for her to get caught and in trouble, thus detained and unable to return to her home because it will have floated away by then. That's just my idea however! Like I said I am very open to change things here as need be. Also, like earlier, I am rewatching the series so I tried to make her as flexible as possible but feel free to correct me on anything that is not possible! If I didn't do a good enough job explaining her personality, imagine her like Ariel from the little mermaid loool