On Bluesky @vgdensetsuさんのイラストまとめ

He drew the backgrounds of the special stages, converted part of the ending into pixel art and made one of the in-game illustrations hidden in the game.

Finally, he drew the illustrations for the Japanese manual, (scanned in a resolution that is hard to see today).

When Mark Cerny brought Yuji Naka to the Sega Technical Institute after the release of Sonic 1, Yamaguchi also joined the North American studio and worked on Kid Chameleon. It was around this time that he moved from traditional colouring to Photoshop and by Sonic 2,

as well as the manual illustrations of the Mega Drive adaptation of Sorcerian, a game for which he also did some of the game's graphics. Since Sega's policy didn't allow him to put his real name in the credits of their games, he chose the pseudonym of Judy Totoya.

It's time for a big thread about Yasushi Yamaguchi / 山口恭史, AKA Judy Totoya (Sonic, Phantasy Star, Sakura Taisen, etc.)

Final Fantasy X illustration drawn by Tetsuya Nomura or the play "Final Fantasy X Kabuki".
https://t.co/Bt23R25c5V

In 1994, Mike Bryan switched from traditional art to digital art medium and, in 2012, he co-created the main visuals for Metal Gear Rising Revengeance (according to his art director, the 3D models were made by other people) https://t.co/ukQ5SJqu63
https://t.co/uBex12Jm4l

Robocop movie poster painted by Mike Bryan and reused for its numerous video game adaptations:

Cover art for the PC-88 game Cosmo Saint Leaza. I assume Akemi Takada / 高田明美 drew it and she thinks so too, but she doesn't remember and isn't credited on the cover, in the manual or on the game ads (not sure about the in-game credits).

3 covers illustrated by former Core Design in-house artist James Ryman: