Silverclaw

Silvermane

Silver Samurai

Silver Samurai (Age of Apocalypse)

Silver Surfer

Sin

Sinister Six

Siren (Earth-93060)

Sir Ram

Sister Grimm

Skaar

Skaar (HAS)

Skin

Skreet

Skrulls

Skrulls (Ultimate)

Skullbuster (Cylla Markham)

Slapstick

Slayback

Sleeper

Sleepwalker

Slipstream

Slyde

Smasher (Vril Rokk)

Smiling Tiger

Snowbird

Solo (James Bourne)

Songbird

Sons of the Tiger

Spacker Dave

Spectrum

Speed

Speedball (Robert Baldwin)

Speed Demon

Spencer Smythe

Sphinx (Anath-Na Mut)

Spider-dok

Spider-Girl (Anya Corazon)

Spider-Girl (May Parker)

Spider-Gwen (Gwen Stacy)

Spider-Ham (Larval Earth)

Spider-Man (1602)

Spider-Man (2099)

Spider-Man (Ai Apaec)

Spider-Man (Ben Reilly)

Spider-Man (House of M)

Spider-Man (LEGO Marvel Super Heroes)

Spider-Man (Marvel: Avengers Alliance)

Spider-Man (Marvel Zombies)

Spider-Man (Miles Morales)

Spider-Man (Noir)

Spider-Man (Peter Parker)

Spider-Man (Takuya Yamashiro)

Spider-Man (Ultimate)

Spider-Woman (Charlotte Witter)

Spider-Woman (Jessica Drew)

Spider-Woman (Mattie Franklin)

Spiral (Rita Wayword)

Spirit

Spitfire

Spot

Sprite

Spyke

Squadron Sinister

Squadron Supreme (Earth-712)

Squirrel Girl

Stacy X

Stacy X (Ultimate)

Star-Lord (Peter Quill)

Starbolt

Star Brand

Stardust

Starfox

Starhawk (Stakar Ogord)

Starjammers

Stark Industries

Stature

Steel Serpent (Davos)

Stegron

Stellaris

Stepford Cuckoos

Stephanie de la Spiroza

Stephen Strange

Steve Rogers

Stick

Stilt-Man (Wibur Day)

Stingray (Walter Newell)

Stone Men

Storm

Storm (Age of Apocalypse)

Storm (Marvel Heroes)

Storm (Ultimate)

Stranger

Strong Guy

Stryfe

Stryfe (Ultimate)

Sub-Mariner

Sue Storm

Sugar Man

Sumo