Not one team per se, I change it up depending on floors and leveled up quite a few chars well above level 100, but when fight real tough bosses I normally go with Rance with Chaos and Champion or Persiom if want him to have more hp (Main difference between Persiom and Chaos except for fiends is that Chaos gives way more crit while Persiom gives more HP and actually due to the bodyboost on Persiom it will also have higher attack when Rance is real high level and more def and MR) , Crook with the tree armor and Buddha or the broom, Suzume (that 1/3 damage can be a lifesaver) with that hits always at least twice shortsword and a miko armor with bodyboost, Urza with Stronger (Make sure to have encourage equipped on her so your healer(s) can focus on either healing or full reviving as needed) and either a mage that is good for that boss (all mages can have magic skill 2 in world 3) or add a fighter/guard with spear or another gunner (Reset if real high level and 100% evasion can be surprising effective due to her skills slap and mysterious reset instead of Urza, just her hp is a problem that is why you will want 100% evasion on her if use her) or healer depending on the boss, whether it does AOE, is immune to magic and such.
For absorbed items I would say that depending on char and item they use that speed, high evasion, crit and stun are most important and that you want to make sure resillience is at least above 20.
Also resetting skills with item or have a char reset to lvl 1 can be quite wise when in world three after level 80. The way white skills work in world three and the new attack 5 at level 80 may well want you to redo your skill points more efficient and useful.
Also if intend to play world 3 from start, do not grind too long in other worlds and donate the unique items preferably to level 8 as soon as possible in old worlds. Especially the Talent R weapons you want to raise talent only once and much easier in world two or three and for the unique items that are not treasure dango exclusive you want to donate them at least once in world three to get the world three bonus level at level 9 weapon upgrade.