There was a awesome game that I remember playing when I was 8-9 for the GBA that was an action rpg that had a lot of different classes and most importantly, coop up to 4 players.
I remember playing as a ninja with my friend, this game reminds me of Monster Hunter just for the city, It was a place when you armored up, put the money on the bank (Because if you died, you lose A LOT of money) and you select which place will you go next. I don't remember if It had sidequests.
And another that I remember that I really liked back in the day was a jrpg in the NDS, in which you have to use the NDS like a book and the plot was very focus on the "destiny" and things like that.
Someone can help me? Especially in the GBA one, I never owned my own cartridge (Me and my friends used to rent it) and It's just missing in my collection.