I see examples of the same player names on Classic HC and Expansion HC. There are also some examples crossing over between Classic and Expansion (non HC). I think the real characters are Expansion.
Specifically, for HC:
For non-HC, it’s pretty much the top of the Classic ladder that appear to be bogus characters.
The character classes list as Amazon on Classic HC, and as other character classes on Expansion. It looks like the characters are getting cross-listed at some point in their progression, and then they don’t get updated on Classic HC.