2003
Nando De Groot as Alucard from Hellsing, and (name withheld) as Victoria from Hellsing.
Anime Expo 2003 Part 6: Thursday (03-Jul-2003)
2004
Ryan as "Vash" (Trigun) and Kasou as "Alucard" (Hellsing). (No last names provided.)
Fanime Con 2004 part 5: Saturday Afternoon (29-May-2004)
Anime Expo 2004 part 23: Monday (05-Jul-2004)