My little guys just mellowed out after, except recently now that spring fever has hit and Asriel is humping everything Bombur has laid on xD Asriel was very shy and timid before his neuter and very high strung. Within a few months though he mellowed out a lot. They’re both still pretty playful and they didn’t real lose the core parts of their personality.

For the litter box could you get like a lower storage container? or cut out a portion of it so it’s easier to get into? At the time of their neuters, they had cages they had to jump 2-3 inches to clear, which was fine.

A beautiful girlfriend maybe for the dapper young gent?

This is a common concern, but I’ve never noticed any negative change in personality when any of my buns were neutered or spayed. Just the unpleasant stuff stopped. Less destructive (somewhat!!) and no humping, less territorial aggression for the girls.