No, and to that point, any character can have a Floodborn card made for them
There's no maximum number of cards you can have in a Lorcana deck, but the minimum number is 60
The bottom compartment will fit the remaining tokens from the Premium set (+ space for more): 16x Keyword tokens Reckless, Cant Quest, Evasive, Cant Challenge, Cant Ready, Support, Rush, Bodyguard, Ward, Challenger +1, Challenger +2, Challenger +3, Challenger +4, Resist +1, Resist +2, Resist +3
That means two characters could quest (or the same one could quest twice), and the next character would cost 4 Ink less
In non-competitive situations where players are just enjoying playing the game for fun and not in any sponsored or official setting, any rules on what cards can be used would ideally be agreed upon by those involved
If youre running an Amber deck, its one that youll definitely want to check out