Hey Manits! Good to hear from you!
For some reason my brain remembered that Hanmyo had something to do with Angel Links, weird considering she died in Outlaw Star.. I have no clue where I got that idea.
I think the only two characters that cross over were Douze and Valyria, and then they weren't anything like they were in Outlaw Star?
Our front runners are, in no specific order, Cowboy Bebop w/ movie, The Saga of Tanya the Evil, Gate, Last Exile, or KonoSuba.
Although I think we still need to go back and watch the OVA Roberta's Blood Trail for Black Lagoon.