at the end of skyward sword the main antagonist Demise is sealed into the master sword to very slowly wither away however we see that in botw2 the master sword was broken. Could Demise be the withered body we see in the first trailer as they look alike

If we use logic from other sources it checks out
Like in dragon ball the elder kai got sealed in the z sword and gohan accidentally destroyed it causing elder kai to be released

Great theory

and that voice could be him too... Also, m/zelda

m/zelda?

imgflip.com/m/zelda
i am advertising this because people don't use it enough

But... Ganon...

yes

lycanrock!

YES

Midnight form!

yup

i like dusk better but before i saw dusk this was my fave form

dusk also used to be my favourite

nice