Making a mod based off of an existing character

[TheMaskedMare]

I'm fairly new to making mods, but I have a mechanic in mind and want to know if anyone could help with it.

I want to make a mechanic like Woody's, where the character transforms into something else when it meets certain requirements. For my mod, I'm thinking about the requirements being lowered sanity. Would that be possible to make?

I have a few more ideas for this mod, but I feel like this is the most important feature to discuss

[Ultroman]

Basic idea post. Example of implementation.

Also, if you're new to modding for DS/DST, check out the newcomer post. It has a lot of VERY helpful information which will save you hours and hours of banging your head against the wall.