What's your PSII party?

[IndispensablePeaGuy]

A recycled topic, but who cares?

Rolf - he's the main character and his techs are badass
Rudo - the tank of the game. High HP and Def and guns for the win
Kain - his anti mech techs are a godsend. Plus he's not a bad hitter too.
Amy - good healer and her double fire staves put her nearly on par with Nei's attacks.

I didn't choose the others because Nei is dead after the 1st boss is killed, Hugh's biomonster techs are rubbish and Anna isn't that great imo.

[Tanith]

Rolf, because there's no choice and he's the most well-rounded of the bunch, anyway.

Rudo, because he has the highest HP and his guns deal consistent damage, not to mention his agility surpasses Rolf's at some point late in the game. Fast tank? Yes, please.

All of the others I rotate, using Kain, Anna and Amy the most and Hugh and Shir the least.

Anna is useful in Skure, Kain is useful in the dams and Dezo fortresses, Amy is useful everywhere (though her low agility is positively infuriating), Hugh can be useful if you level him up high enough to where his techs don't miss as much and his low defense doesn't get him killed in one hit (or just put the Nei Shield on him), and Shir steals star mist and moon dew (and the visiphone if you're not using an emulator). Otherwise she's a waste of time. Nei doesn't count.

[Zucca]

Rolf, Rudo, Amy, Anna.

[Wing Eye]

I've always used Rolf, Rudo, Anna, and Amy. But in my recent play-through I'm considering trading Kain for Anna.

[Zucca]

Replace Amy with Kain and you have most offensive combination.
Prepare yourself with *mates.

[augmentedfourth]

I always take Rolf (of course), Rudo, Anna, and then I alternate between Amy and Kain, depending on my mood. I level up Shir enough to steal the visiphone and then leave her at home. I honestly don't think I've ever used Hugh that much, I don't have the patience.

[Zucca]

Shir can stole Fire Staffs at quite early point of the game. This way you can have the best weapons for amy before you land on Dezo.
Also I remember She can stole GiRes items and very good crown for herself and Amy.
I remember seeing a statlist (Ben can point link here on PS Cave ;D) where was stated that the success rate of stealing the Fire Staff for example is 5%.
So to get all these "valuable items" you must have some level of patience.

[Tanith]

I get the fire staves before I battle Neifirst. They're great weapons until they're edged out by Kain's/Hugh's laconian maces. (As a side note, I'm not too thrilled with all the medieval weaponry in a fairly hard sci-fi game, but it's a minor complaint.) And yes, Shir steals jewel crowns, as well as shune boots for herself. She also steals items that can be sold back for some good moolah in the first half of the game, like laser shots.

One of my first times playing through the game I spent a good portion of my summer break taking Shir shopping until my end game team was loaded with Star Mists and Moon Dews. I still can't believe I spent all the time doing that, but hey, I won.

I'll also note that acid shots should not be overlooked as decent weapons, especially in places like Uzo island and around Kueri, with all of the flying biomonsters, and then again in the dams with the heavily armed mechas. Whereas a laser knife is basically useless against the big mechas, the acid shots will allow you to take Hugh along (if you REALLY want to take a biologist through the dams). I think if you equip two, they deal about 50 points of damage combined per round (don't quote me on this), and since they're guns, that's the damage they deal for any monster/mecha. Not too shabby.

[Zucca]

I think Shuneboots are the best for shir... :)

[BenoitRen]

My preferred team is Rolf, Rudo, Anna and Amy. Amy is swapped out if I want to take someone else along, like Kain.

[IndispensablePeaGuy]

Anna sucks. Kain is miles better.

[Zucca]

Just remember to equip Kain with Nei Armor then. ;)
That's a combination I've never tried...

[Wing-0]

Anna sucks. Kain is miles better.

Kain ain't pretty. Anna is...

It's Rolf, Rudo, Anna and Amy.

Anna can be changed as the need arises. Kain is good at the dams, yes... But I tend to grind an extra and keep Anna in the later parts of the game.

[BenoitRen]

Anna is pretty good with groups, and doesn't need TP to power her attacks.

[tilinelson2]

For me it is always Rolf, Rudo, Nei and Anna then Rolf, Rudo, Anna and Kain. I don't need Amy because all the healing is done by items. It takes a bit longer, but you will always find some weak opponents that allow you to max out your chars with free healing provided by the healing items.