You do not have to donate or be an admin (that lets you set your own though). If you have been around for a while and ask nicely Theymos will set them for you.
really?
can you give some accounts that was given a privilege to have that Custom Titles? already viewed some accounts on the lists...
Guess you're right.
But, I doubt theymos will do that in this current era, for someone whose not been quite well-known here?
I wonder how'd they get that

Seriously, want to have one too!
CT:Madruine/JulieClarence
Mine was changed so there is an example. I think it depends on a few factors if he would change it...age of account, reputation, etc..