The origin radical and the origin kanji are the same!
The origin of everything can be found in Genji (げん). Genji is the name of the main character in the world's first ever novel, "The Tale of Genji."
Picture him as a rich, pretty boy who cares a ton about his looks and gets along really well with all the ladies. He's also really great at poetry, which helps the lady situation.
Currently there are no similar looking kanji which exist in the WaniKani learning system