If a character like Miranda Lawson from Mass Effect met Mercer, she would probably be fascinated by his biological makeup. She might try to analyze him from a scientific perspective, which Mercer may or may not tolerate. And when it comes to combat, Mercer could provide a new and unexpected element to the fight. For example, he could use his shape - shifting to surprise enemies while the Mass Effect characters use their biotics and tech. Also, the loyalty and morality of the Mass Effect characters could have an impact on Mercer. He might start to question his own actions and motives in the face of their strong beliefs.
The Krogan in Mass Effect could view Mercer as a kindred spirit in a way. They both have a certain raw power and a willingness to fight. Mercer could potentially help the Krogan in their struggle for a new homeworld or more rights. However, the Krogan's violent tendencies might also clash with Mercer's more self - centered goals at times. And the relationships between the different races in Mass Effect would also play a role. For instance, the Turians would be very concerned about Mercer's presence and might see him as a threat to the established order, while the Quarians might be more interested in how his powers could be used to help them reclaim their home.
The more stoic Gundam characters like Amuro might initially be reserved in their interactions. But as they face common threats, they would start to open up and share their knowledge. In contrast, the more outgoing Mass Effect characters like Garrus might be quick to befriend the Gundam pilots and try to get them involved in their adventures right away. They could bond over their shared love for combat and protecting the innocent.
The Asari from Mass Effect would be intrigued by the Ancient technology in Stargate. Their natural curiosity and long lifespan would make them eager to study it. Meanwhile, the Goa'uld from Stargate might see the various species in Mass Effect as potential hosts or slaves, which would obviously lead to conflict. But the more moral characters from Stargate would oppose this and try to protect the Mass Effect races.
If Tali met Naruto, she would be amazed at his ninja skills. Tali is used to advanced technology, but Naruto's physical abilities and unique jutsus would be a whole new concept for her. Naruto would be interested in Tali's engineering skills and might ask her to help create some new ninja tools. Garrus would probably respect Naruto's combat skills and see him as a valuable ally in a fight. And Naruto would be drawn to Garrus's sense of justice.
The Krogan from Mass Effect and the Berserkers from Gears of War could have a really intense interaction. The Krogan are known for their brute strength and warrior culture. The Berserkers are these large, powerful and somewhat mindless (in a combat sense) enemies. The Krogan might see the Berserkers as a worthy challenge and try to engage them in combat on their own terms. This could lead to some epic battles where the Krogan's natural strength and regenerative abilities are put to the test against the Berserkers' brute force.
The characters from Call of Duty, being mostly military - based, would likely be initially cautious and strategic when interacting with Mass Effect characters. For example, Captain Price might approach Shepard with a sense of respect but also wariness. He would be interested in Shepard's leadership skills and how they handle the diverse alien races. Meanwhile, Shepard would probably be curious about the more 'grounded' combat tactics of the Call of Duty soldiers.
Noble Six would probably be a bit of an enigma to the Mass Effect characters at first. They might be cautious around Six because of their different appearance and unknown abilities. But over time, they could learn to trust each other.
Shepard from Mass Effect might initially be very cautious around the Crysis characters. Given Shepard's military background, they would likely be sizing up the situation and the capabilities of the Crysis characters. For example, if faced with a character in a nanosuit, Shepard would be curious about its technology. Meanwhile, the Crysis characters would probably be in awe of the diverse alien races in Mass Effect. A character from Crysis might be shocked to see a Krogan for the first time and initially be on guard.
The characters might initially be cautious of each other. For example, Shepard from Mass Effect could be skeptical of the Star Trek crew's non - violent approach at first. But as they get to know each other, they could start to share their skills. The Star Trek crew could teach Shepard about their advanced medical techniques, while Shepard could show them some combat maneuvers.
Naruto might initially be confused by the Reapers. But his natural curiosity would lead him to try and understand them. He could try to communicate with them using his own unique way, maybe through his chakra. If the Reapers attacked, Naruto would respond with his combat skills. He would be very direct in his approach, not afraid to engage in battle.
Alex Mercer would be the most interesting. His abilities are so unique. In the Mass Effect universe, he could completely disrupt the power balance. He can shapeshift into anyone, which means he could infiltrate the Citadel Council or any other important organization with ease. His superhuman strength and regenerative abilities would also make him a formidable force against the enemies in Mass Effect, like the Collectors or the Reapers.