HELP! (fanfic advice.)

v. overused plotlines

i. the "i'm a weasley who's in love with harry potter!"
okay. it's official! i'm tired of seeing this plot. and why is the oc's name always rose? i mean, i get that she's twins with ron... but c'mon. george and fred are twins and their names are nothing alike. but back to the plot, it's simply become annoying. the weasleys have seven kids already, they don't need an eighth.

ii. the loner who has no friends and is bullied relentlessly until she meets an extremely popular character.
as we stated in our cedric diggory plot area, hogwarts is a large school! i get that you want your character to be a unique character, but really?... characters sleep in dorms together, they eat together, they go to school together. they would be able to make at least one friend.

iii. a really dark characters son/daughter
my first question: WHY WOULD YOU MAKE YOUR OC TOM RIDDLES CHILD. 1+1=fish?? tom riddle literally murdered people, shamed people for their bloodlines, and tried to kill a baby. so why would you want to have him have a child??