Eitheir you can or not have it there, state what playable characters would form your dream team, that perfect team, in the games you have played.
Here's mine, for an example (any questions, just ask):
Final Fantasy I:
You can only choose four out of six classes here, so there isn't much to choose from. But I guess my dream team would be Monk, Red Mage, Thief and White Mage. I valorize White Magic more than Black Magic, but Black Magic is needed to get rid of certain monsters, hence why the Red Mage, that can have a few Black Magics in his pockets while also some White Magic. Monk for high damage and Thief because it is my favorite class and speed.
Final Fantasy II:
Everyone is a freelancer in a way, with some having more specific classes. Considering everyone has their own more specific class, my dream team would be Minwu, Ricard, Maria and eitheir Guy or Josef. Minwu is a White Mage, I need him; even though there are no specific commands for dragoons, I like Ricard and he deals a fair amount of damage; Maria would be my Black Mage (even though I made her a White Mage in my playthrough, but her inicial states are more for Black Magic) and Archer (always good to have some long range damage dealer); finally eitheir Guy with two Axes or Josef barehanded for that big amount of damage, Guy representing Berserker and Josef representing Monk, both classes great damage dealers.
Final Fantasy IV:
Finally, people with assigned classes! Anyway, my dream team would be Cecil, Rydia, Edge, Porom and Yang. Cecil as a Paladin has that little amount of White Magic that can come in use for some backup at any time and also deals a fair amount of damage, and even as a Dark Knight he would deal a good amount of damage, so I wouldn't complain; Rydia is my Summoner and Black Mage, ready to kill the enemies before they take a look at her; Edge is my dear ninja, with two weapons, Throw and awesome speed, the battle hasn't even started the monsters are dead already; between Rosa and Porom, I find Porom a better healer, which is a little sad, considering Rosa is an Archer and I love Archers, but oh well, I need a good healer, not someone who takes millenniums to heal me; finally Yang is the Monk for that sweet Monk damage and high HP to survive when the others can't.
Final Fantasy V:
Everyone is a Freelancer, so it's more of which classes do you want, but even so. My dream team would be Galuf as a Monk, Krile as eitheir a Black Mage or a Summoner, Faris as eitheir a Thief or a Ninja (Ninja most probably) and finally between Bartz and Lenna Lenna as my White Mage. I must say, I am following RK's view on the characters a little, but at the end of the day this is what I'd like. As long as Bartz is not there I'm ok. Then, a Monk for damage, Black Mage or Summoner for magic damage, White Mage for healing and Ninja or Thief for fast damage (since Ninjas wield two swords that would be very convenient).
Final Fantasy VI:
It's more which commands do you want rather than anything else. So, my dream team would be Gau, Sabin, Terra and then eitheir Setzer, Cyan, Shadow, Umaro or Relm. This is a bit of a hard one for me. So, Gau because he is my favorite character and can be very strong with the correct Rage, and for me that's the Io Rage; Sabin is for that sweet Monk damage and gotta love the Suplex, or any other of his Blitzs, but Suplex wins all; Terra is for a more balanced character, but probably more focus on the magic part (also Trance to raise your stats); the last member is a hard one really: Setzer would be for long range damage and Slots, Cyan would mostly be for the Bushido, Shadow for fast attacks, Throw and Interceptor with his Instant KO attacks, Umaro for the Berserker strength and him throwing party members, or Relm for a healer (based a lot on her job in RK) and also her Sketch and Control are very useful.
Final Fantasy VII:
This is an easy one. My dream team is Vincent, Cid and Yuffie. Vincent for long range damage naturally, the cool transformations and a magic user; Cid for a character focused more on physical damage; and finally Yuffie for another natural long range damage dealer, Ninja like commands, like Throw and her speciality: Morph. Besides, they are my top 3 playable characters, I don't like everyone else, Red XIII is the more acceptable of the rest.
Final Fantasy VIII:
In case you're wondering and haven't noticed, yes, temporary playable characters count. Which means my dream team would be Squall, Kiros and Ward. My 3 favorite playable characters. It might seem stupid, considering only Squall has a vast amount of Limit Breaks from the three, but that's all I need honestly. I barely use the other Limit Breaks of the main six, sometimes not use at all, so it isn't a big of a deal. Besides, in terms of battle animation, Kiros and Ward are my favorites. And gotta love Squall's extra damage!
Final fantasy IX:
Back to assigned classes and commands. My dream team would be as simple and practical as Amarant, Eiko, Freya and Quina. They are all I need. Amarant and Freya for damage and some backup abilities like Aura and Reis Wind; Eiko for the true healing, Holy and the summons, namely Phoenix; and Quina for their Blue Magic, which is the only one I actively search for and use in the series. If only you didn't need to have Zidane I could achieve this.....
Final Fantasy X:
Eitheir you want to consider having a complete Sphere Grid or not is up to you, but in the end, this is more focused on each's speciality and Overdrives. That means my dream team would be Rikku, Yuna and eitheir Tidus or Auron. Rikku for her high agility and speed and her Mixes that save a life; Yuna namely for the Aeons, but also the better healing; finally eitheir Tidus or Auron for damage, Tidus for fast, but weaker damage (and the Time Magic) and Auron for the stronger, but slower damage. Good thing you can switch party members mid-battle, though this is considering as if that wasn't possible.
Final Fantasy X-2:
There's only Yuna, Rikku and Paine as playable characters, so let's go by dresspheres. My dream team, considering each has a different dressphere, would be White Mage, Thief, and Warrior. Basically like in the beginning, except Gunner is White Mage. Not making everyone having a different dressphere, then everyone Warrior, with perhaps a White Mage there too. That's literally all that's needed to pass the game, Warrior and White Mage..... There are other dresspheres I like, Berserker and Dark Knight for example, but I'd prefer Thief for the two attacks that help in a chain, Steal, Flee and the smaller turn gauge. I'm not really counting the special dresspheres of each, I think that's cheating for this thing.
Final Fantasy XII:
I'm going by the original version because that's the one I have, which means everyone is a freelancer, and considering the way I do gambits, everyone is basically the same..... Anyway, my dream team would be Reks, Reddas and Larsa. Lol, no one of the main six. What can I say? I love these dudes. Larsa is definitely my healer (like in RK); Reddas is the damage man; and Reks comes with Thunder and Cure already, so he is the backup. Not necessarily the strongest team in Ivalice, especially considering Reks is literally the tutorial of the game and only playable during that time, which means he is weak as hell compared to Larsa and Reddas, but hey, let's imagine he isn't that much weaker, ok?
If you're going by the Zodiac Age version, then choose the characters and what classes, I guess. I'm not very aware how does it work.
Well, that's all I have. Soon, I should have Dirge of Cerberus, but as far as I know, only Vincent is playable, so not much room for a choice. Besides, I still don't have the game.