Okay, well this is one of my Harry Potter OCs, Marigold!

Well, Marigold is Corianders([link]) twin sister and was sorted into Slytherin.
She's in her third year I think? That means she's around 14-15 years old.
She's slightly under average in most subjects, apart from flying lessons and care of magical creatures .That thing she's holding? It's a flobberworm she kinda keeps as a "pet" (Yes, I know it says they can only have a owl, cat or toad in the book... she keeps it with all the other creatures but it's a well known secret she's the one who takes care of it) why does she like such a icky useless thing? Well no-one asked her but she just does, she was never scared of snakes and bugs as a child, in fact one of her favorite hobbies was to catch bugs from the small puddles near her house and use them to scare the girls who kept teasing her twin Coriander.
So, as you can see, Marigold is much braver then Coriander, even thought Coriander is the older twin (By around a hour >_< ouch.) she's not exactly mean, but you shouldn't anger her... her mother was a muggle (Their parents divorced after the mother found out about her husband being a wizard.) and only found out about her daughters powers when a boy who was teasing Marigold suddenly started to puke slugs... so yeah, messing with her is not the smartest move you could make.