Sigma Posting (Follow on BS)さんのイラストまとめ

Sigargoyle

Source: Gargoyle
Castlevania: Bloodlines (Genesis) by Konami

Karmigma the Wizard

Source: Karmine the Wizard
Crystalis (NES) by SNK

Sigma head edited from sprites by @hansungkee1 and Aburtos

De-Varsigma

Source: De-Vars
Phantasy Star IV: The End of the Millennium (Genesis) by Sega

Dennisigma the Maverick

Source: Dennis
Dennis the Menace (SNES) by Ocean Software

Cúchuligma, the Impure

Source: Cúchulainn, the Impure
Final Fantasy Tactics (PlayStation) by Square

Sigmerrek

Source: Kerrek
Peasant's Quest (PC) by Homestar Runner

Sigmoad

Source: Toad
Super Mario Bros. 2 - Super Mario All-Stars Version (SNES) by Nintendo EAD

Heavy Blast Sigman

Source: Heavy Blast Man
Sonic Blast Man II (SNES) by Taito

Sigdeath

Source: Death
Castlevania: Aria of Sorrow (GBA) by Konami Computer Entertainment Tokyo

Sigriffin

Source: Griffin
The 7th Saga (SNES) by Produce!