Information on "Transparent Mario" for the Nintendo 64 is extremely limited, and it's likely a ROM hack or a custom game, rather than an officially released title. Without further information, details on gameplay, developer, and publisher are unavailable. It's probably a fan creation playing on the popular Mario character.

Transparent Mario

Toy Story 2 - Captain Buzz Lightyear auf Rettungsmission! (Germany) (Rev A)