No idea how to get a comet trail on your cursor, but I did find oneko. Maybe it can help out if you want a cat chasing your cursor:
http://www.daidouji.com/oneko/
Re:A few HiDPI tricks for Linux
by filereaper on Sunday January 31, 2021 @03:27AM
(#25977129)
Thanks for this! My mouse cursor is tiny on 4k monitors with i3
If you, like me, are blind as a bat may I recommend `Xcursor.size` as well.
Anyone know how to get mouse cursor comet trails in Linux?