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

Bigma Arm

Source: Big Arm
Sonic the Hedgehog 3 (Genesis) by Sega Technical Institute

Sigattnoizma

Source: Gattnoizer
Syvalion (Arcade) by Taito

Sigoro

Source: Goro
Mortal Kombat (Arcade) by Midway

I think I'm getting old, so I might be misremembering how the first three Mega Man X games go...

Low effort traces, I just couldn't resist when the thought came to me.

Source: Peanuts by Charles Schulz

Gatling Sigma

Source: Gatling Robo
Wild Guns (SNES) by Natsume

Great Sigmonian

Source: Great Dragonian
King of Dragons (SNES) by Capcom

Sigmadramelech

Source: Adramelech
Castlevania: Circle of the Moon (GBA) by Konami

On the flip side...

Hypno Sigma King

Source: Hypno Worm King
Adventure Time: Hey Ice King! Why'd You Steal Our Garbage?!! (3DS) by WayFoward Technologies

Kid Sigbuu

Source: Kid Buu
Dragon Ball Z: Hyper Dimension (SFC) by Tose