>>529407461
Clubs and Martial Arts for Gob
Wild Child/Feral Youth/Martial Arts/Berserker for Papi
Merchant first for Vanilla, she's good utility
Teeny's actually the worst of the four (Vanilla's really not that bad, she's just not suited for direct combat) but she can handle fun support jobs like Service and Cooking so have her train in those, as it will enable her to let Papi and Gob do ridiculous things later on.
For what it's worth two others have run through to the end with the Four Bandit Team (at least one on Paradox) and beaten it with them, and it's because their strongest attribute is actually the free stat buff they give each other just by existing. So having all four of them out will boost all of their stats a lot.
You could also have Mini join them if you want, as she's effectively the Honorary Fifth Bandit and has become friends with all of them. Even if she doesn't get the stat buff the others do, she rounds them out well with her specialties in Dance/Wing/Breath, and while her trait isn't perfect she still has a cool crisis mechanic and free auto-revive.
Either way I wish you luck anon!