Besides a Witch of Life, what other classpect could create an afterlife or something of the sort?

See, this is a tricky one, because while “Changing Life” is definitely what the Bubbles did, she was only able to do it through her connection to the Horrorterrors- One of the few forces in Homestuck that come the closest to actually being Omnipotent Gods. (Although as I’ve mentioned before, nothing in Homestuck is truly Omnipotent or Omniscient, but yeah)

So while it thematically fits the Witch of Life, not every Witch of Life would be able to pull off a feat like the Bubbles. In fact, given the connection to the Horrorterrors, a Void Player could have a better time, generally speaking, than another Witch of Life.

That aside? Heart would definitely be the Aspect to look into, Souls being the most important part of the equation when it comes to an Afterlife. Lord/Muse of Heart may be the best option for something like this.