I presume you mean Aquaman.
I went back and forth on introducing Namor because I knew it meant I'd have to make a choice regarding Atlantis that could potentially step on the toes of someone wanting to pick up Aquaman. Then I realised that person didn't exist and I did, so not world-building for fear of offending some imaginary person was pretty stupid, especially when I could world-build in such a way as to allow for a future PCed Aquaman to exist alongside Namor.
It being a Year One game I thought the likelihood of someone wanting to play Namor was slim, so better to make Namor the NPCed king of Atlantis at the outset than Aquaman given that Curry is a likelier candidate to be applied for at some point. If I'd made Curry king it would have shut more doors than it was worth, as it were.
And if you didn't mean Aquaman then ... yeah, feel free to ignore all of that.
Yea, I meant Aquaman. Considering how far in the future second characters are, I didn't have any real plans, but I thought of making Namor Aquaman's surly uncle/mentor who helped him escape after a coup against the Royal family. Now, should I ever get to do the story, I can just sub in someone else for Namor.