So, I couldn't find any pictures of fell!Undyne in full armor on the official underfell blog and most of the fannon designs are normal Undyne but with more spikes (I know that's basically underfell in a nut shell isn't it)
So I thought what if instead of her being the "captain" she would be like the leader of the rebellion or something. Sence so many people (including me) like to picture Galahad (fell!papyrus) as the captain of the guard. They would still be best friends tho
I don't have the brain power to explain more than that right now 🤣
If you ever have the time to screw around and learn useless information about the past, go look up medieval helmet/sword/armor/shield types and look at all of the different varieties and uses of each. I think it's cool how things in medieval times were still being revised and engineered, even if those things were used for not-as-cool reasons.