It seems that Nishimura Kinu designed the characters, but I couldn't find any information on the pixel artists. To be honest, it's incredibly challenging to find the details you're looking for because the subject is quite niche. Although some people have nostalgia for the game, Cyberbots didn’t perform well and quickly faded from arcades.
Additionally, around year 2000 or so, video game companies were concerned about losing their valuable staff to headhunters, so they required employees to use obsqure pseudonyms in the credits, making it difficult to connect names with their work. While character designers and prominent figures are known, information about lower-ranking artists and programmers often remains in the shadows and/or overlooked.
If you’re really, really, determined, you could try asking for information on
Quora.JP in Japanese. There’s a better chance of finding niche details there, but be aware that it might turn into a bit of a burden.
