Anyway, AP wise The Player takes it. Ender Dragon is a pretty casual 25 kilotons and Steve can tank his attacks very well. Meanwhile Banjo & Kazooie downscale from a 23 kiloton feat. Steve has a greater defense than offense though, with his fully enchanted diamond armour + potions + shield + totems of undying + regen (Anyone who's played Pot PVP knows how annoying it is to kill a player who has just the former two even with the best weapons in the game). Steve's flame arrows should be hotter than nether heat, so B&K's heat resistance isn't good enough to cover that, whereas fire resistance potions deal with fire eggs + flame breath. Steve has the AP to get through their regen + healing after a while, although invulnerability is still a problem, and B&K get 40 seconds of that total. Can't see anything aside from Grenade Eggs doing much damage to Steve, although ice eggs will be a problem as Steve hasn't encountered full on freezing before, nor has he experienced telekinesis which prevents Steve's summoning or melee combat, forcing him to use bows and tridents, both of which are pretty easily dodged/blocked with wonder wing, although ender pearls can allow Steve to escape the magic wrench TK after a while. Their type 9 is largely irrelevant since without it Steve becomes 9-A and potentially BFR'd, but totems work fine.
Between B&K's regen, healing, TK to keep Steve away and 40 seconds of invulnerability to no-sell anything Steve tries, I believe B&K have ample chances to land an ice egg or two to freeze Steve in his tracks.
What? If you're frozen there's nothing to respawn from. Steve would just be stuck there, all iced up. Same way how Steve likely wouldn't respawn if he was transmutated.
Steve is a 9-A when he respawns. All Banjo has to do is tap him and he's dead. He's not getting his stuff, and outside of game mechanics it takes more than a right click to put armour on. And again, that's assuming his respawn point is near enough to where they're fighting.
This is late game Steve we're talking about here. He's just gonna spawn in his house, get more stuff from his chest, and run back out to find them with a map. And I'm sure that ice is gonna eventually melt.