Here are the nicknames that Harper calls the others and what the others call him. (For this book at least):

Logans nickname for Harper: Sugar Child or Pasta Prince
Logans nickname from Harper: Momma Lo or Crofters King
Pattons nickname for Harper: Cookie Ball or Hyperactive Chaotic Smol Bean
Pattons nickname from Harper: Papa Patton or Papa Puppy
Romans nickname for Harper: Lord Hype or Kangaroo
Romans nickname from Harper: Uncle Roman or REEEEEEEE
Virgils nickname for Harper: Kit Cat or Fluff Ball
Virgils nickname from Harper: Vee-Vee or Storm Lord
Emilles nickname for Harper: Rosey  (then when he found out rose quarts isn't the best person and after the movie) Spinel
Emilles nickname from Harper: Nanafua or Pearl
Deceits nickname for Harper: Sour Square or Slow Sloth
Deceits nickname from Harper: Dee-Dee or Hiss Hippo
Remus' nickname for Harper: Ferret or Wrecking Ball
Remus' nickname from Harper: Mousie, Duckie or Chucky
Remys nickname for Harper: Love Bean or Silly Shades
Remys nickname from Harper: Re-Re or Love Latte
Thomas' nickname for Harper: Hype or Jitterbug
Thomas' nickname from Harper: Storytime Sibling or Disney Dad

Should I make ship names for Harper with the others? Or should I save that for if yall choose to have me make a separate fanfic book?