Since Trello's merge with Atlassian I can no longer find the option to change my initials that's visible in Trello. I am using Trello with one who have the same initials as I have. Would be nice to be able to change this, since you can't tell any difference between us. Now the only option seems to be to change full name.
OK :/ That's a shame. But thank you for the answer!
That's true. You can only change your username to a name that is not in use by another user.
For more information :
https://help.trello.com/article/728-changing-your-username