From my findings, the following accounts are mostly impersonated: @dobartim, @thejohalfiles, @dimimp, @surfyogi.

Interesting that you came accross these accounts. I have often seen @ipromote, @trevonjb or @ngc, but also @xaero1, @slowwalker and some others.

I'd be interested in what they wanted to sell your friend via Discord. I just know about them selling upvotes or delegations, at least that's what they say, ofc it is a scam.