List of nicknames used on Glee (Source: Glee Wiki, some from memory). A few have been left out so if you can think of any just post in comments)
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RACHEL
Rach, A-Rach, Babe, (Finn)
Miss Bossy Pants, Eva Peron (Mercedes)
RuPaul, Man Hands, Treasure Trail, Stubbles, That Thing, Sweetie (Quinn)
Yentl (Dakota, Santana)
Boy Hips (Lauren)
Benedict Arnold (Kurt)
Dwarf, Midget, Hobbit (Santana)
Barbra Streisand (Suzy Pepper)
Lady, Michele (Sue)
Baby, My Hot Little Jewish American Princess (Puck)
The Jew (YouTube user)

FINN
Finnocence (Santana)
Frankenteen (Santana, Dakota Stanley, Sue)
Sugar Ray (Sue)
T-Rex (YouTube user)

QUINN
Lucy, Fabray, Juicy Lucy (Lauren)
Quinnie (Mother, Father)
Babe, Baby, My Baby Momma, Real Housewife of Reno (Puck)
Q, Preggo, Sister (Sue)
Cliché of a Blonde Girlfriend, Barbie, Little Miss Perfect Prom Queen (Rachel)
Tubbers, Stretch Marks (Santana)
Queen of the Chastity Ball (Dave Karofsky)
Missy (Shannon Beiste)
Little Miss Peroxide, Blondie, High School Hussy (Kendra Giardi)
Pretty Blonde with the White Girl Ass (Mercedes)
My Girl (Sam)
The Ghost of Grace Kelly (Jesse St. James)
Lucy Caboosey (Old Classmates, herself)

PUCK
Baby (Mercedes)
Puckzilla, Puckasaurus, Puckster, Puckerone, Pucky Puck, Finn Hudson (himself)
Puck, Puckerman (everybody)

SANTANA
Sweetie, Honey (Brittany)
Sweet cheeks (Holly Holliday)
Satan (Mercedes, Kurt)
Devil in a red dress (Kurt)
Sandbags, Boobs McGhee, Jugs The Clown, Tweedle-Fake Boobs (Sue)
Sandbags (Becky)
Auntie Tana, Rachel, Eva Peron(herself)

BRITTANY
Britts, Britt-Britt (Santana)
Britt, Boo (Kurt)
Tweedle Dumb (Sue)
Rain Man with boobs (Finn)
Mike Chang (herself)

KURT
Lady Face (Azimio)
Gay Kid, Lady, Lady Trousers, Porcelain, Sweet Porcelain (Sue)
My happy happy unicorn (Brittany)
Lady Lips, Teen Gay (Santana)

BLAINE
Blaine Warbler (Rachel, Kurt)
Warbler Blaine (Wes)

MERCEDES
Jackée, Aretha, Whoopi, Brassy Hag (Sue)
Wheezy (Santana)
'Cedes (Santana, Artie)
F.A. (Dakota Stanley)
Ms. Jones, My client (Lauren)
Lazy B-O-N-E-S (Jesse)
Jones (Will)
Effie (Santana, Kurt and Puck)
Beyoncé, Closeted Diva (herself)

ARTIE
Buddy (Will)
Wheels, Legs (Sue)
Wheelchair Kid, Young Jedi in a Wheelchair, Professor X (Puck)
Art, Blue Tooth, Stupid Boy, Stubbles McCripple-Pants, Four Eyed Loser (Santana)

TINA
Asian, Tina Cohen-Loser (Sue)
Unsung Hero, Blue Eyes (Rachel)
Happy Girl Drunk (Finn)
Self Hating Asian (Mike)

MIKE
Dancing Ninja, Situasian, Mikey (Tina)
Changster, Other Asian, The Dancing Asian (Sue)
Mike (everybody)

WILL
Schue (Principal Figgins)
Mr. Schue (Glee Kids)
Man-Whore (Quinn)
Slut (Emma,Sue)
Buttchin, SpongeHair SquareChin, Weepy The Vest Clown, Macaroni Hair (Sue)
Four Loko, Count Boozy Von Drunk-a-Ton (Santana)
Mr. S (Finn)
Hot Stuff (Holly Holliday)

SUE
Lady (Shannon Beiste)
Susie (Doris Sylvester)
Miss Sue; Mi'ja (Imelda)
Sexy Lady (Will during the Drunk Dial)
General Zod (LOD)

EMMA
Ms. P (Mercedes Jones)
Emms, M&M, The Emmster (Ken Tanaka)
Homewrecker, Miss Crazy Pants (Terri Del Monico)
Edie, Arlene, Alma, Edna, Irma, Esme, Ella, Bony Red Headed Hominid, Little Miss Golden Marmoset, Mentally Ill Ginger Pygmy (Sue)
Bambi (Kurt Hummel)
Girlfriend (Holly Holliday)
Freaky Deeky (Rose Pillsbury)

SAM
Big Mouth, Biebster (Puck)
Lady Lips (Azimio)
Ken (Rachel)
Macaulay Culkin Stunt Double (Sue)
Biebs, Sammy Evans, Guppy Lips, Grouper Mouth, Froggy Lips (Santana)
Sammy (Stacy)
Trouty Mouth (Santana and Jacob)
Hobo McBieber (Jacob)
The Blonde Bieber (himself)

JESSE
Marvelous Marvin (Sue)
Jesse St. Sucks (Kurt)
Mr. St. James (Mercedes)

LAUREN
Fat Ass, A whole lotta woman; My Girl, Baby (Puck)
Zizes (Rachel, Puck, Quinn, Santana)
Miss Zizes (Jacob)
Poppin' Fresh, Endangered White Rhino, Grimace (Santana)

MATT
Shaft (Sue)