Project Argo was an unannounced R&D project where the player was a large human-sized creature in-game, but also controlled a smaller character and they helped each other progress and move through the level, similar to the VR game Moss.
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I sketched a large number of concepts for the tiny character, you can see a few of them here. I explored a few inspirations, including axolotls and owls.
Process video of my drawings for the axolotl expressions