The River Person in Underswap is a mysterious figure, only found by random chance in a room in Waterfall.
River Person is swapped with W.D. Gaster
Most people do not use the swapped version of W.D Gaster and River Person for UnderSwap, for two reasons. One, because Gaster and River Person aren’t normally used in UnderSwap things (roleplay, art, etc) and two, because people prefer the other version of Swap Gaster.
Anyways, because of this lack of attention for their canon swaps, their isn’t much story to them because they don’t have much attention canonically, either. It’s quite unfortunate.
very helpful you guys, best page, right up there with scp 12