InterfaceLeader
Pro Adventurer
I vote for a monster that you run into outside of Midgar that drains ~25% of your XP/AP with every hit.
Seriously though, I don't think it's that complicated. Cap the levels, and all the other grind-y nonsense; but make sure it's still a fun and satisfying game. Provide some secret materia that do very specific things that are helpful for the secret bosses in that episode and are just kind of fun and quirky elsewhere (ala underwater materia). Throw in some other secret collectibles to reward exploring that carry over and give a bit of an advantage in the early part of the next game but that are quickly superseded. Throw in a bit of hidden lore and a few bonus cutscenes for everyone to post to TLS and analyse for days on end. Everyone's happy. (Well, I am, and that's what counts... )
Seriously though, I don't think it's that complicated. Cap the levels, and all the other grind-y nonsense; but make sure it's still a fun and satisfying game. Provide some secret materia that do very specific things that are helpful for the secret bosses in that episode and are just kind of fun and quirky elsewhere (ala underwater materia). Throw in some other secret collectibles to reward exploring that carry over and give a bit of an advantage in the early part of the next game but that are quickly superseded. Throw in a bit of hidden lore and a few bonus cutscenes for everyone to post to TLS and analyse for days on end. Everyone's happy. (Well, I am, and that's what counts... )