So I just watched up to Fortress Breakthrough Boogie (The Fortress in Robotech). My observations so far:
Stig isn’t quite as tortured as Scott. He’s all about the mission, but not quite the obsessive straight arrow stick-in-the-mud type.
Mint is totally obsessed with men and her body. She speaks way more often about how eager she is to meet men and about her body in general. Every bit as annoying as Annie and intentionally so.
Yellow Belmont is more “manly” than Lancer, so to speak. Much more a soldier.
Aisha isn’t really compared to Marlene Rush and of course never given the name “Marlene”. She’s more about Scott moving on from his past than about his obsession with what he lost.
Houquet isn’t the total man-hating type. She shows more vulnerability and is a much more sympathetic character than Rook.
Jim isn’t much different. Maybe not so much of a moron like Lunk comes across at times.
The Inbit speak in some sort of grunting language so it’s more about the telepathy. The Regis isn’t seen at all and rarely mentioned.
The entire tone and setting are a much more bleak picture.