I've had a idea for a unique encounter and have a question. Ideas please

The encounter will be with Alien and each Robot is designed to easily defeat a specific hero but against any other Hero are useless

For example the Green 1 can go toe to toe with The Demi God Thor and win with almost no effort but against any other hero, even a a weak hero like Aurora, it can't win and will easily be destroyed

I think that been done in the comicbooks and they learned to switch robots and win.
Adaptable program? Since it software switching when they switch? But take a turn to do so?

Also the same that a robot that can beat Thor, could beat Wolverine but not Aurora, you can mix it up for your adventure idea.
A robot can repair itself by absorbing any vehicle kind of thing
Infect a vehilce and it turns into a robot as well in 5 rounds, etc etc

If you want to have it so that a robot designed to defeat a specific foe but make it easier for others, then set up what the base abilities are for the robot, then have it's attacks gain a +1CS damage boost against the specified foe, and the specific foe is at -2CS on all attacks against the robot. This gives the robot a significant advantage, but it's one that is lost when turning to another opponent, whether that foe is completely different or even very similar.

I'm sure it's too late, but you need to give the specific heroes to do this much justice.