I need some ideas for cosplay!!

That depends on your look. If Du don't wear a peruke and a bought costume then Du 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 hemd, shirt 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, oder if Du have a lighter hair color, Du can dye it to the color of any Anime character with colored hair (Examples: Fairytail; Natsu, Jellal, oder Juvia. Ouran High School Host Club; One of the twin's hair when they had their fake fight) Du could get a wig too, if Du want. For the body , it doesn't really matter if Du are skinny oder if Du have big muscles. That's just how Anime characters are made. Boys are muscular, girls are skinny, but that doesn't matter. For skin tone, Du can wear face paint, oder wear clothes the color of the skin of the character. I hope this helps!