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Unfortunately, it is not possible to change your profile name.
 
Shame. I'd love to have that option too since Pichu is very close to a certain Czech word (I blame my clan mate in another game lol).
Pichu is also an adorable pokemon! (And is what i thought of when i saw your username. Maybe i've been watching too much melee)
 
Necro-ing an old thread; but it seems my name has been changed to something rather montrous after a few years of not being on the forums.... is there a reason for this?
It means you had an account on the old forums, pre-Paradox account, that used the same email as you've used here.

It ought to have merged automatically. Log out of all Paradox sites, delete all Paradox cookies and log into here directly, the merge ought to then complete.

If not lodge a support ticket at paradox.zendesk.com with full details, including if possible what your user name was in the old forum.