Lawyer Man, Attournor, Ian (myself) and all such characters were modded by myself, with occasional assistance from NinjaBoyNeo.
Guts Tank made by Andrusi
Johnny Bravo made by NinjaBoyNeo.
Kalinka Cossack made by Cecil/Tengu Maul.
16 Bit Snakeman made by HJE-Cobra.
16 Bit Sparkman made by Amplitude/Andrusi.
Additional 16 Bit Elecman Sprites by Guy the Spriter
Most other 16 Bit Robot Masters sprited by Auto.
16 Bit Reggae made by Amgis.
Jetpack made by Ronald_MacK.
Keep in mind, some of these sprites may not have appeared as of yet.