Now that Nintendo is embracing the "classic mario" aesthetic, more YouTubers need to become familiar with the names Yoichi Kotabe and Shigehisa Nakaue. Kotabe solidified the 2D Mario look in the late 80s and early 90s, and Nakaue has been carrying that torch in newer games.
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Here's some scenes that Yoichi Kotabe animated
They've been doing similar on their Dav Pilkey adaptations, too. It feels like the book art but animated.