On the prefixes: given the four "basic" (European, Warhead, Ambush, Nonchalant) patterns of capture/non-capture allowed, we have prefixes for those with zero (Ancient), four (Eurofighter), or two (all six ways) powers. Missing are those with three. Proposals:
anti-European (must capture at least once): HUNGRY
anti-Warhead (may not capture twice): DIETING (no second helpings!)
anti-Ambush (if first is passive, second must be too): ELECTRIC ("It has to warm up... so it can kill you" of Wednesday Addams' electric chair)
Anti-Nonchalant (if first is capture, second must be too: ADDICTED (gotta keep killin'...)