EDIT: And check out Legacy, it's another realtime, party-based first person cRPG.

http://www.redshift.hu/

Aaah, that's right, forgot the op wanted party based ones.
Fighting Fantasy really has clunky controls, it kinda killed it for me.
I'll have to check The Quest, looks fun.

LOL, those aren't FPP. :) The Mount & Blade games are definitely RPGs, but also a very different kind of RPG in that regard. I have to agree though that they would seem to fit the bill in terms of the requirements stated by the OP though. I forget how large you can make your party, but if memory serves correctly it could grow to 10 or more NPCs in your party over time, so long as your leadership was good enough to hold the party together as it got larger and had people with varying ideas of how things should be done. I only put significant time into the original Mount & Blade game though. I tried Warband out as it is the one that everyone raves about, and while it did seem to have cool improvements over the original game, I found the controls to be a bit wonky from what I was used to in the first game, and the game as a whole was much slower and had stability/graphics issues on my system that I was never really able to resolve. In terms of overall gameplay though, from what I've seen of all the M&B games they are all party-based RPGs in FPP/TPP focused on tactical combat.

Additionally, there is the up coming Kingdom Come Deliverance RPG which seems of a similar nature to the Mount & Blade games, and also the upcoming Mount & Blade sequel - Bannerlord. There's another game that totally escapes my mind at the moment that might qualify as well. If I think of it I'll add it here later.

Yeah! I haven't played it, but it's got tons of content and looks really fun. Also check out Legacy and other series by the same dev, Legacy is for PCs as well. :)

Have you tried Mazes of Fate or Deep Labyrinth, since I assume you've got a DS? The first one is a really good GBA game that was ported over to the DS, and also looks good. Do you ever play any multiplayer DS games, btw? Over altwfc? We could play together if you're interested! :)

Thanks for mentioning this! I'm not sure if it will be useful to me (I don't own ActionReplay), but I'm glad it exists. Maybe someday I can figure out how to unlock the "DLC" on my copy of DQIX without going around the world searching for someone who kept an old save.

Nope, haven't played those. I've barely touched my DS recently, tbh. And i've never tried any multiplayer on the DS ^^

Wow, lot's of new suggestions, thank you. It looks like Frayed Knights and Demise are the closest to what kind of game I tried to describe, although i haven't tried either yet. But there are plenty of good games mentioned here that I will look in to.