Braids, simple or if you can more complex ones, waterfall braid is really pretty! Straight hair. Curly hair (I prefer curls with the wands, but a regular curling iron looks good too). Buns (try a higher bun) messy, or neat, either looks good. Wavy. Crimped (either with a crimper, or braid when it's wet before bed and sleep with it in, then in morning should look pretty, but don't brush if you can)
Boys: Bald, High and Tight, Buzz, Very short fro hawk Girls: With black or brown hair I think would look best, If blonde maybe pony tails or just all down. I don't know I'm not an expert on hair styles.
Messy bun, straighten it, wear it down, braids, my favorite is half up and half down( looks cute, and hair is out of your face) Make sure to change you hairstyles up, to make it new and people will notice it! Hope that helped!
I don't know how long your hair is, but there are some really simple and cute braids you can try. I love watching a Youtube channel called Luxyhair. They have so many hair style videos. I use many of them, and I have very curly hair (that is long).