Tropers / Mk 97

Usually go by Mk_97 or Mk97. I cannot sync the former account with the latter — I can't create an identity with an underscore elsewhere. i.e. I'm stuck as Mk_97 on one computer and if I log out of that account I may lose access to that underscore-marked account for good, and on every other computer I'm Mk97 — without the underscore. I also go as Scrander, though that is a rare occurrence.