Pokécharms

Maybe I can help? I love creating any new characters, ponies and other kinds too!

Sure~!

Okay so you said you already have a name for the ponysona, do you have any idea what you want them to look like or be?

Yep, they are gonna be a pegasus, have a light pink coat, blonde mane and tail that's kinda like Rainbow Dash's (though I'm probably gonna change it even though I love Rainbow's mane and tail style), and light blue eyes that are grayish sometimes. I'm not sure what her cutie mark should be, whether she should have a large family or a small family, and what her pet should be... (Her name's Little Fluff, by the way XD)

(that name is adorable btw )
Well finding out what her cutiemark should be is probably the first thing we should figure out. Cutiemarks are often related to the personality, proclivity, or talent of the pony character.

(I was bored and played a MLP making game one day and my pony's name was randomly generated, and it was Little Fluff, so yeah... I chose that name for her instead of my original idea for her name, which was Ocean Abyss XD)
Probably, though I want it to be related to water, and I also want it to be related to animals since I love animals, which makes it a bit hard...

Though I kinda want it to be animal related since she wears a stetson hat and that makes her look like more of an animal lover to me.

Well she could be talented with caring and working with animals as a veterinarian. But not sure how she can be related to water. Other then maybe previously living in a place near water where she cared for the sea life?

Being somewhat related to water is just optional, though, so her just being talented in caring and working with animals would work! Maybe she could be talented at dressing animals up or giving them makeovers, or drawing, as a secondary talent?

By secondary talent, I mean a talent that she could have instead of the other if it seems more fitting depending on where she lives or how her family is. (I like having backup options, don't judge me XD)

( Don't worry I don't )
And ponies can have more than one talent. Fluttershy is good with animals but she can also sing very well. Her main talent seems to be with animals though. So the main talent is what the cutiemark normally refers to.

Caring for animals would probably work with being able to draw very well as a second one. Maybe her cutie mark could be something with a puppy or kitten? I'm not sure what, though.

Well what would be better would be a paw print of an animal and not an animal for a cutiemark I think. Although that is just my opinion.

That'd work! Maybe two or three light brown paw prints? ...Though I honestly can't tell the difference between animal paw prints. XD

Haha lol same! XD
And yeah that sounds pretty good. And if you need anymore inspiration there are some cutiemarks of paw prints you could look at to help you design your own cutiemark for your character. https://www.google.com/search?q=paw+print+cutie+mark&rlz=1C1CHBF_enUS726US726&source=lnms&tbm=isch&sa=X&ved=0ahUKEwi2z8yvxunWAhVI7SYKHQ-IDYEQ_AUICigB&biw=1366&bih=637

I just looked at those and one of them is a rainbow colored paw print with what looks like mud splattered around it, so I kinda wanna try to do something somewhat similar to that, I think, plus it kinda reminds me of art/drawing, and I love drawing too just like I love animals and Little Fluff is supposed to be based off me somewhat.

Alright! Glad those helped!

Now I just need to figure out how big her family should be and what pet she'll have.

Hmm, well for a family I suggest a large one. You already see a lot of characters with small normal family. So if your character had a very large family with many younger and older siblings I think that would be interesting. But again choose what you want, a character can still be interesting even if they have a smaller family.

I think I want her to have a big family with a lot of siblings, since I've always wanted a big family and a lot of siblings even though it'd never happened plus I'm not a big fan of being social in real life and I'm really shy. I could actually use the name Ocean Abyss for an older sister for her, since that was going to be her name until Little Fluff.