Nothing will be the result, because you need similar body types for it to do anything.
Dragon Ball spinoffs say that there will be a result, albeit a hilarious-looking and usually underpowered one.
By my command seal I order you, Shuten-chan, Raikou-san, fuse.Just takes the pose as normalTrying to match Shuten.Believed the Halloween rumours about a fused Raikou and Shuten.
(Not too sure on this translation, mainly on what 新鯖 is supposed to mean. Apparently it might be slang for new server. If anyone knows please update)