Professor Kusco
A colleague of Professor Daiba, Kusco is a linguist who deciphers the ideographs on the Mazone pennant, which, even though they're different every time we see it, apparently always read "This is the second homeland of we, the almighty Mazone." His attempts to convince the earth Parliament that the Mazone are an alien race that once had contact with the ancient Mayan civilization fall somewhat short of success, and he is ultimately assassinated right in front of the Earth Garrison HQ, damn the luck. (Source: cornponeflicks.org/harlock/friends.html)