Maybe in the fanfiction, Mega Man and X find out they are from parallel universes and have to figure out how to get back to their own worlds while also dealing with threats in the new combined universe. They could learn new abilities from each other during this process.
One idea could be that Mega Man and X team up to face a new, extremely powerful enemy that neither could defeat alone. For example, a virus that can adapt to their attacks instantly.
Chapter 5 is the strongest chapter-level answer because it starts from Actually, when Manager Fang saw Jiang Li, he was somewhat surprised. and follows through on Recently, he did suspect that his wife was cheating on him, but due to the.... The payoff is that the chapter closes with "Fuck!
Chapter 18 is the strongest chapter-level answer because it starts from In the corner, a girl in a black dress sat quietly, holding a glass of... and follows through on Hurry home, what is a young lady like you doing running to a place like....
The best chapter pointer here is Chapter 32, ""Shining Transformation Trip" Official Lineup Announcement!". It opens with You should know, an ID photo is like a mirror for demons. and closes on With airflow comes water flow, and your fortune will naturally improve."....
Chapter 905, "I Plan to Quit the Circle", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter gives readers a real answer by opening on The loud slogans echoed repeatedly across the expansive lawn.
Chapter 919, "Two More Grandsons", is the clearest early answer because it turns Wan Huixia's situation into a concrete plot event. The chapter turns that into something concrete by moving from She turned around and immediately saw two little buns reaching out...
Look to Chapter 33 for the clearest answer. It begins with Following the announcement, five artists respectively reposted the Weibo—..., keeps building through Instantly, "Shining Transformation Trip," already under intense scrutiny,..., and lands on Although Su Yinwan was considered half a.
Look to Chapter 22 for the clearest answer. It begins with Hearing this, Su Yinwan looked at Shang Shaojing with a face full of..., keeps building through Shang, but it's not necessary;
Look to Chapter 40 for the clearest answer. It begins with [Jiang Li claims she copied this herself?, keeps building through But her calligraphy is actually this pretty?] [Jiang Li dares to boast,..., and lands on The handsome guys on this show are so difficult to deal with..
Chapter 3 is the strongest chapter-level answer because it starts from Qiao was still annoyed at the attitude of this unknown girl when she heard... and follows through on Jiang Yan, forced into a marriage with someone he did not love, had....
A practical answer is Chapter 13, because it turns the idea into a concrete scene. The chapter opens with Sensing that something was off with Jiang Yan, Jiang Yan dismissed the..., adds pressure through He probably had a good guess who it was., and ends on How could this happen..." Lin Manru.