List of usernames with special characters:
._.
banned-user.1
banned-user.2
banned-user.3
banned-user.4
banned-user.5
banned-user.6
banned-user.7
banned-user.8
banned-user.9
banned-user.10
banned-user.11
banned-user.12
crystalkeeper7.old
david (admin)
deleted.account.meower
impossible usernames
griffpatch.old
joshatticus.old
scolder.renamed
tris.banned
willy.
Thank you!