So I was listening to the UT soundtrack and noticed some similarities between Undertale's True Lab and Lab Discoveria from Kirby and the Forgotten Land. Both are abandoned labs containing monstrous creatures that merge together. (they also use the phrase "Here we are.") Sooooooooooooooooooooooooo why not make Kirby's Soul Bosses as the Amalgamates? And why not start with the first?
Nintendo and HAL Laboratory - Kirby franchise Toby Fox - UNDERTALE Art made by me!