Well class distinctions are especially hazy for Alchemicals, since they can switch out their charms on the fly and EVERY one of them is a tinker to at least SOME degree.
-We're the tactician, and in charge of mass production of items once we get that up and running. Our drawbacks are that we're pretty terrible at social-fu or gaming the system, and we have to rely on armor suits and conventional weapons for our combat ability. On the other hand our experience crafting the two and our ability to mass produce items means we can pump them out for use by others as a major force multiplier. We'll also be gaining XP faster than the other members of our assembly, so we can afford to generalize a bit while our recruits will need to specialize more to remain effective. To that end we need to pick people who already fill the roles we need to some degree, so that their current skills will synergize with what they earn as Alchemicals.
-I'd like someone good with healing, and with the kind of mods available that fit into that class they could result in something halfway between Panacea and Bonesaw in terms of capability and available skills. There is actually an ability that can restore everything short of a total amputation and one that can cure even that, but the former can be used on someone else while I"m not sure about the latter. A good craftsman/medic can make stop-gap limb and organ replacements easily and far superior ones as well, though those will need the creator to have EOD or they will take to long to produce. Base creation time for a high quality limb is 100 hours, while an internal organ is 200. I'd like either Panacea or Bonesaw for this role, although recruiting Bonesaw has several problems, from the Public's negative reaction to the difficulty or recruiting her in the first place. Both of my candidates have some serious mental issues, though Panacea would likely be easier to heal than Bonesaw.
-We need someone who can get stuck in and stay there. Someone with a good heavy punch and lots of durability. Someone with that kind of raw power would need to be very conscious of how that same power would frighten normals, and would need to be able to handle that. Bascially we need a LITERAL textbook example of the Jade Caste. My personal preference for this would be Chevalier. The public loves him, and as someone has already discussed earlier his powers would make him an insanely durable Alchemical. Warstrider Chevalier would be the spongiest sponge to ever sponge. Give him an Autochthonian beamglave (which wouldn't take too much of an effort for him to convert to given what he already swings around) and he'd also do a great job stripping Soak stats and breaking gear on his opponents. Armsman could fit this role as well, but he's more Orichalcum than Jade, since he's rather cold unlikeable and authoritative. Getting him to fall in line and not try to run the show would probably be pretty difficult.
-We need someone to take care of hum-int., either manipulating public opinion (making us look good and spreading the joys of Bullshit Robot Communism) or gathering info on our opponents. Glen would be a PR GOD with alchemical upgrades if we could convince him to work for us and stop trying to handle us. On the other hand if Coil doesn't kill her off I think it would be easier to recruit Tattletale. I KNOW SOME PEOPLE DON'T LIKE HER, THIS IS MY PERSONAL OPINION. She would be perfect for gathering information and manipulating public perception wouldn't be that much of a leap for her. Her analysis would also make her a deadly combatant. Her analytical skills would allow her to pick out an enemy's weak points easily, and being an Alchemical would giver the tools to exploit them and the durability to survive combat.
-This leaves two slots unfilled, and I'd prefer to fill them with generalists of a sort to keep us flexible. To that end I'd like to pick up Kid Win and Vista. We already have positive Intimacies with both, we're social peers and it would be fairly easy to get them to follow our lead.
-Kid Win would help us boost our tech development immensely as an actual Tinker as opposed to our basically emulating one. His speed and durability would make him an excellent ranged fighter, with the speed to stay at range and avoid damage and the durability to take a hit if his speed fails him. His speed also makes him an ideal fast response unit.
-Vista's ability also makes it easy for her to move around quickly, as well as letting her create and/or exploit tactical opportunities. Her skills would also make her deadly in combat, and she could easily fill both ranged and melee roles and be terrifying in both. Heck she could kit out as both and switch between the two literally at will.
And with that, my ideal Power Rangers Super Friends Venture Squad Assembly is complete.