Ya think that maybe Wander a long time ago was at a Cosmic Conjecture and he wished to be able see the whole universe and the Cosmic Being granted him immortality.
And what if now he (Wander) goes to those locations in each galaxy when the planets in said galaxy align every millennium (which can vary based on galactic timescales of planetary orbit), to make sure those that get wishes don’t misuse it, like, for evil, personal gain or say living forever and seeing all your closest friends die as a result of your immortality.
or maybe he wished to have pretty sick skills on a banjo, who knows.
never forget that the very first episode of wander over yonder featured emperor awesome pointing at his crotch as his legs were spread, saying that he would take hater “all the way down” to awesome town
headcanon that in ‘the picnic’ wander came away with like two pictures of the actual galactic conjunction and like 100+ pictures of just. hater hater being annoyed, hater chasing him, hater fighting awesome, hater standing in front of the celestial being, just s o much hater