I need some ideas for cosplay!!

That depends on your look. If 你 don't wear a peruke and a bought costume then 你 should dress like somebody with the same hair color as you. I recommend Nico Robin from film Z for black hair. Nami in her dress 衬衫 water 7 outfit for red hair and any outfit from Lucy Heartfilia for blonde hair. Those are easy to make even without having to buy a cosplay.

Anyone with your hair color, 或者 if 你 have a lighter hair color, 你 can dye it to the color of any 日本动漫 character with colored hair (Examples: Fairytail; Natsu, Jellal, 或者 Juvia. Ouran High School Host Club; One of the twin's hair when they had their fake fight) 你 could get a wig too, if 你 want. For the body , it doesn't really matter if 你 are skinny 或者 if 你 have big muscles. That's just how 日本动漫 characters are made. Boys are muscular, girls are skinny, but that doesn't matter. For skin tone, 你 can wear face paint, 或者 wear clothes the color of the skin of the character. I hope this helps!