[quote=@Pie Flavor]
Hey, I was wondering are we still bound by the one character rule or no? (Was that even a rule?) But was wondering if I could introduce a character later perhaps if that was allowed.
[/quote]

I was not tracking that there was a single character rule. If you would like a second character, then go for it. However, your second planeswalker would not have been born on our "misplaced" plane. Maybe visited and made it home.