Undertale Sans- Sans, Comic, Classic
Undertale Papyrus- Papyrus, Captain,
Underfell Sans- Red
Underfell Pap- Edge
Underswap Sans- BlueBerry (mostly Blue), BB
Underswap Pap- Rus (short for Pyrus, I feel like he’d be lazy enough to go that route. Never liked Stretch, honey, carrot or Orange tbh),
Swapfell (red vr) Sans- Black or Razzberry(Razz), M’lord
Swapfell (red vr) Pap- Mutt
Dancetale Sans- Campbell (for hip-hop Locking, which used to be called Campbellocking)
Dancetale Papyrus- Tango
Outertale Sans- Nova
Outertale Papyrus- Apollo
Horrortale Sans- Axe
Horrortale Paps- Paprika, Sugar, Echo, Jupiter (iv recintly found a bunch of popular nicnames for him and their all so cute!)
Underlust Sans- Hart (Play on Heart)
Underlust Paps- Desi (Spanish/Latin name that means Desire or Desired)
Fellswap gold Sans- Wine
Fellswap gold Papyrus- Coffee
Swapfell purple Sans- Sourgrape (Grape for short)
Swapfell purple Papyrus- Cash
G!Sans- Ganz (G for short)
G!Paps- Green, Aster,
Mafiatale Sans- Colt
Mafiatale Papyrus- Sniper
Mafiafell Sans- Bullet
Mafiafell Papyrus- Rifle
Mafiaswap Sans- Caliber
Mafiaswap Papyrus- Ricochet
Mafiaswapfell Sans- Smith
MafiaSwapfell Papyrus- Winchester (Chester for short)
Dancefell Sans- Breaks
Dancefell Papyrus- Salsa
Danceswap Sans- Samba
Danceswap Papyrus- House
Danceswapfell Red Sans- Mambo
Danceswapfell Red Papyrus- Scooby (for the Scooby Walk)
Go check it out! They're pretty cool :D