There are 12 Chronicles in total, so there will be 12 different spells per character by end game. However, as many of the spells are repeated across different characters, the number of unique spell animations is probably much much lower than that.
For example, Healing Glitter may be a spell from Fierce Regalia on one character, but is received from Boundless Amber on another.
my guess for Mark of the Stars is that each character simply has 1 unique ability based on their Star... if we can use both Maricas, maybe they have the same MS (or MoS?).
Yep. Apparently the mark of stars represent powers from the stars that manifest themselves through their bearers, hence the title Starbearers. Say, when the Hero received power from Shining Legacy, he is effectively receiving the same power from the Tenkai Star of the world where that Chronicle came from. And so on, and so forth.
As for the Maricas, let's just say they are not unlike the two Vikis when it comes to star assignment~