Sure, here are various nicknames for someone who is always negative:
- Pessimist Pete
- Debbie Downer
- Negative Nancy
- Gloomy Gus
- Sour Sam
- Downer Dave
- Raincloud Rachel
- Bitter Betty
- Cynical Sid
- Mopey Mary
- Grumpy Greg
- Whiny Wanda
- Miserable Mike
- Dreary Dan
- Complainy Connie
- Gloomy Gail
- Negative Ned
- Sour Sue
- Pessimistic Pat
- Dreary Dawn
- Grumble Gus
- Moany Max
- Sad Sally
- Whiny Will
- Bleak Ben
- Testy Tom
- Pouty Pam
- Glum Glen
- Sulky Steve
- Grumpy Gail
- Complainy Carl
- Negative Nellie
- Brooding Bruce
- Cynical Cindy
- Miserable Mel
- Moody Morgan
- Worrywart Wendy
- Downer Dan
- Pessimistic Pam
- Grumble Gary
- Gloomy Greta
- Sullen Sam
- Bitter Brenda
- Negative Nick
- Cynic Cynthia
- Mopey Mike
- Glum Grace
- Whiny William
- Dreary Debbie
- Complainer Chris
- Morose Martin
- Sulky Susan
- Testy Tim
- Moany Mary
- Negative Nelly
- Miserable Mitch
- Sad Sam
- Bleak Betty
- Cynic Carl
- Pouty Paula
- Grumpy George
- Gloomy Gwen
- Pessimistic Paul
- Worrywart Will
- Complainy Cassie
- Dreary Drew
- Moody Matt
- Sour Steve
- Whiny Wendy
- Negative Norman
- Sulky Sally
- Cynical Craig
- Bitter Barb
- Gloomy Gordon
- Miserable Maggie
- Moany Moe
- Complainy Claire
- Grumble Greta
- Downer Donna
- Testy Teresa
- Pessimistic Peter
- Mopey Mabel
- Sullen Seth
- Gloomy Gill
- Bleak Bobby
- Cynic Cindy
- Miserable Mark
- Grumpy Gail
- Negative Nevin
- Sour Sonia
- Worrywart Wade
- Sulky Sharon
- Dreary Darren
- Complainy Courtney
- Moody Maureen
- Testy Ted
- Pessimistic Paige
- Bitter Brett
- Glum Gordon
- Whiny Whitney
- Gloomy Greg
- Sulky Sandra
- Cynical Chad
- Miserable Martha
- Grumpy Gavin
- Negative Nia
- Sour Stuart
- Mopey Morgan
- Worrywart Willa
- Dreary Dave
- Complainy Cole
- Grumble Grant
- Sullen Sawyer
- Pessimistic Peggy
- Bleak Blake
- Testy Taylor
- Bitter Brianna
- Gloomy Graham
- Moody Marcy
- Glum Gina
- Negative Nestor
- Cynic Cory
- Whiny Wesley
- Complainy Casey
- Miserable Mia
- Grumpy Glen
- Pessimistic Polly
- Sour Scott
- Dreary Daryl
- Mopey Mandy
- Gloomy Garry
- Cynical Calvin
- Sulky Serena
- Bitter Bruce
- Negative Noelle
- Complainy Cody
- Testy Trina
- Whiny Wade
- Miserable Mitch
- Grumpy Gemma
- Pessimistic Perry
- Mopey Mark
- Gloomy Gloria
- Dreary Denise
- Cynic Calvin
- Sulky Spencer
- Bitter Beth
- Negative Nate
- Complainy Camden
- Testy Tina
- Whiny Whitney
- Miserable Melissa
- Grumpy Garrett
- Pessimistic Pat
- Mopey Michelle
- Gloomy Gavin
- Dreary Doris
- Cynic Cassidy
- Sulky Scott
- Bitter Blake
- Negative Nelly
- Complainy Craig
- Testy Ted
- Whiny Will
- Miserable Maura
- Grumpy Grayson
- Pessimistic Parker
- Mopey Morgan
- Gloomy Gus
- Dreary Deborah
- Cynical Cameron
- Sulky Sherry
- Bitter Bryan
- Negative Nathan
- Complainy Curtis
- Testy Tiffany
- Whiny Wyatt
- Miserable Mason
- Grumpy Gary
- Pessimistic Patricia
- Mopey Matthew
- Gloomy Gwen
- Dreary Dwayne
- Cynical Cathy
- Sulky Simon
- Bitter Bradley
- Negative Nolan
- Complainy Chloe
- Testy Trevor
- Whiny Willa
- Miserable Melanie
- Grumpy Gabe
- Pessimistic Penny
- Mopey Mike
- Gloomy Gwen
- Dreary Don
- Cynical Cindy
- Sulky Stephanie
- Bitter Brett
- Negative Nola
These nicknames capture the essence of someone who is often negative or pessimistic while offering a variety of names to suit different contexts.