This is the original pattern from 2014 reposted.

Finished size is about 9 inches tall for small Baymax and XL Baymax is 15 inches tall.

Baymax from Big Hero 6!

His fingers are made using a hook one size smaller than the one you use for his body. He works up quickly! Size 6mm eyes.

Big Baymax instructions:
Use “Bernat Blanket” yarn and a size K and I hook.
Follow the pattern as written except for the fingers. Instead of ch6, sl st 5 you will only ch6. The plush yarn fills in the stitches well. If you are using a different super bulky yarn you’ll need to go down even more hook sizes and do the slip stitches. Size 15mm eyes.