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

Sigmalessi

Source: Alessi
JoJo's Bizarre Adventure: Heritage for the Future (Arcade) by Capcom
A guest edit by @ManaosManMKII

Sigmario and Kaiser Sigmario

Source: Mario
Super Mario World (SNES) by Nintendo EAD

Sigmatigue

Source: Fatigue
ActRaiser 2 (SNES) by Quintet

Siggy the Dolphigma

Source: Buffy the Dolphin
Wario: Master of Disguise (DS) by Suzak

Sigmooper

Source: Kooper
Paper Mario (Nintendo 64) by Intelligent Systems

Sigmeratops

Source: Dobkeratops
R-Type (Arcade) by Irem

Sigmeku

Source: Neku
The World Ends With You: Solo Remix (Mobile) by Square Enix and h.a.n.d.

Karaigma

Source: Karai
Teenage Mutant Ninja Turtles: Tournament Fighters (SNES) by Konami

Sigmachi

Source: Heihachi
Namco × Capcom (PS2) by Monolith Soft

Old Sigbot and Pararigma Sig-38Σ

Source: Old Robot and Pararoid S-38s
Mega Man X2 (SNES) by Capcom