Here is my attempt to group them by era to help folks understand the evolution of the franchise: FINAL FANTASY through FINAL FANTASY V : Rooted in fantasy, linear narrative, fixed party
And depending on the one you pick, youll get a different effect
Yuffie, Materia Hunter steals an artifact while equipping herself, and is an aggressive body with an aggressive Ninjutsu ability, and Barret Wallace rewards you for having a ton of equipped creatures out by dealing massive damage
Then you can toss double those counters here as +1/+1 ones
With cards like Items and Actions, these are the classifications
Legality depends on the tournament format -- Cecil, Dark Knight // Cecil, Redeemed Paladin can be legal in some formats and banned or restricted in others