Since playing Baldur's Gate for the first time (and loving it), I had a new idea for a game I'd like to make.
Baldur's Gate meets Suikoden.
For those who aren't familiar with Suikoden, it's a Playstation RPG that has 108 recruitable characters. Most of them are hidden or take some effort to get to join you. They all have their own battle manuevers, combo attacks, spells, classes, etc.
There is also a home base that you get in those games where all the characters you recruit gather. Not only can you switch them in and out of your party, just having them in your stronghold will make a change to your stronghold in some way. Some characters will open up an item shop, others will sell you scrolls, tell your fortune, train you, offer you rare items and quests, etc.
So, I'd like to see Baldur's Gate isometric gameplay with 100 recruitable characters and a stronghold that changes based on who you recruit.
Now, I don't expect all 100 characters to have one million words of dialog and romance options, but each character would have a personality and some unique text/voice as they do in Baldur's Gate.
I personally prefer quantity of companions that you can recruit over a handful of them that have a million words of flavor text each, but that's just me.
So, you'd meet this characters in the wilds, in towns, dungeons, etc., and they would join your cause. Sometimes you'd have to help them with their problems first, by either doing a quest for them or having some other unique event that would trigger them to join your group (such as having a minimum of 50 recruited characters already, which would impress them enough to join you, etc.).
Back at the stronghold it would upgrade and evolve based on which characters you currently have.
Some characters would be extremely difficult to get to join, and these would be the most powerful characters. For these characters, you would need to lure them by possessing rare items or doing some difficult quest to get them to join you.
And again, the game would be like Baldur's Gate, with large, isometric maps to explore and a party of 6 to 8 characters at one time.
Like Suikoden, some characters would have a natural affinity with other characters and allow them to unlock special maneuvers in battle. For example, a brother and sister duo who can do some special combo attack that their father taught them. So it would benefit you to have characters with affinity in the party together.
One could even expand this idea further and have affinity grow between party members based on how they interact with each other. Characters at your stronghold could become friends and train together, unlocking some new spell or ability to use in combat if they are both present in the party. Things like that to encourage experimentation and interactivity in your party.
I haven't fully fleshed this idea out (obviously), but it's something I'd like to see. Baldur's Gate is an amazing game but I feel it could have benefited by having a home base stronghold where you can send all the party members who wish to join you, rather than just leaving them in the wilds never to be seen or heard from again.