to me it seems as tho every merc has those typical abilities. healing factot supersenses, agility, etc. wat are some abilities that would mak a formidable assassin but they would be different then regular assasins?
OR temporarily. Rogue would have made one of the the greatest mercenaries alive. Especially with her Skrull shapeshifting, and invaunrability, strength and flight (also her underdeveloped seventh sense). Think about it she could get close to anyone by absorbing someones memories (thus gaining acces codes, character personality traits and knowledges) and morph into them with skrull power. Noone could tell them apart since she knows how they would normally behave and not act conspicous. The absorbed person would also be unable to warn anyone (well I spose she could just have killed them too) since they would be knocked out. Invaunrability, strength and flight also gives her ability to access places and fight if caught or if the marc fights back.
And if she had er call-back powers when she could access any power she'd previously absorbed, she'd be unstopable!