Well, perhaps in this crossover fanfiction, the Titans in the Titanfall world start to malfunction due to some strange chakra - like energy. Naruto, being an expert in chakra, is called upon to investigate. Along the way, he befriends some Pilots and together they figure out how to stop the chaos and also learn from each other's fighting styles.
A crossover could involve the characters swapping abilities. Imagine Tracer from Overwatch having the ability to call in a Titan like in Titanfall 2. Or a Titanfall 2 pilot having the ability to use some of the support abilities of the Overwatch heroes, like Mercy's healing. This would create really interesting and unique combinations in combat scenarios.
I think Naruto himself would be very interesting. His never - give - up attitude and his powerful jutsu would make for great interactions in the Titanfall universe. He could befriend Pilots and learn about their technology while also showing them the power of ninja skills.
The plot could center around a new threat that only the combined forces of Titanfall 2 and Overwatch can defeat. For instance, a powerful alien race that has the ability to disrupt technology, which affects both the high - tech Titans and the various advanced weapons and gadgets in the Overwatch universe. So, heroes from both sides must put aside their differences and fight together.
The IMC soldiers can also be great for crossovers. They have their own set of skills and motives. In a crossover with a stealth - based game universe, the IMC soldiers' combat tactics and equipment could add an element of intrigue.
One idea could be a crossover with a mecha anime. Picture the Titans from Titanfall engaging in battles alongside the giant robots from an anime like Gundam. The different piloting styles and technologies could create some really cool action scenes.
Another interesting concept is that some of the Titans could be modeled after the RWBY characters' weapons or fighting styles. For instance, a Titan with a scythe - like weapon similar to Ruby's Crescent Rose, and it could have a special ability based on her speed and agility.
A really interesting storyline could be centered around the conflict between the two factions in Titanfall and how the Overwatch heroes get involved. Maybe the Omnics from Overwatch are somehow related to the IMC or the Militia in Titanfall. This would lead to a complex web of relationships and battles. The Overwatch heroes would have to adapt to the Titanfall combat style, and the Titan pilots would learn to work with these new, diverse heroes.
One idea could be that the Titans from Titanfall end up in the world of RWBY. They could team up with the Huntsmen and Huntresses to fight a new, powerful Grimm threat that is too much for either side to handle alone. The Pilots could share their advanced combat skills with the RWBY characters, and in return, the RWBY characters could teach the Pilots about the use of Aura and Semblances.
In an 'Attack on Titan' and 'Titanfall' crossover fanfiction, there could be a plot where the world of 'Titanfall' is somehow connected to the world of 'Attack on Titan' through a rift in space - time. The Pilots could be sent to the 'Attack on Titan' world to help in the fight against the Titans. They could introduce their Titan - mech technology to the people there. The story could also focus on the cultural shock that both sides experience. The Pilots would be shocked by the primitive living conditions in 'Attack on Titan' while the 'Attack on Titan' characters would be amazed by the high - tech machinery of the Pilots.