Right. I've managed to code a basic simulator up (half because I didn't want to sim manually, and half because I enjoy coding anyways). I reduced my armor down to a base 19 (23 with mage armour, I simmed with 23). Simulating over 10,000 battles each:
Bebilith: 100% winrate
Fire giant: 70-80% winrate vs 1, 0% winrate vs 2
6 Trolls: 56% winrate. With 5 trolls, its 92%.
Mind flayers: This is incredibly dependent on who wins the initiative and if I fail or make the will save vs mind blast. I do have third eye and IHF to reroll 2 failed saves, so I think it's likely even if I go last, and fail both saves, that I can charge one and one-shot it with limbripper vs its terrible fort save. Then it's DC17 vs my 13+dice roll for the second flayer, and with 3d4 averaging about 7, if I fail, I'll still eventually die as at some point it's going to either hit me enough to slowly kill me, or it will get lucky and hit me with all 4 tentacles and insta-gib me. However, I should win about 75% of the time here.
Vrock: Eventually it's going to fail its will save and have to teleport over to bite me, at which point I'll grapple it and kill it. Even if it manages to succeed for a number of rounds, I think eventually I could catch up to it using charge + double move, and seeing as you need a move action to pick up a new weapon (rock) and a SA to telekinesis it at me, you'll either have to start running or stand and throw, at which point my (40 * 2 (due to charge) standard action + 40 * 2 move action) = 160 means it'll take me 5 rounds to close. I think I should make it, but I'm not 100% sure, and simulating this is kinda hard.
Shadows: nope, ghosts are spoopy, crab no like (I lose).
Blue dragon: This guy would need on average about 6-7 passes to kill me with its breath weapon (average 45 damage, say I save a couple times), which would be about 12-21 rounds. During this time, it would need to make a will save vs my delicious crab, which it would make on about a 50/50 chance (dc 23, YA dragon = +13), and will
only be able to bite me. At this point it's going to get grappled and I'll probably start yanking its wings off, so I think I could probably take it. Two I dont think I could take - they'd both need to fail their saves really quick, and I'd need to grapple both. My sim says if they both just came down and started biting me, I have a 50% chance to win, and if I add in me taking a breath attack or two, its 0%.
Cleric: Again, this depends on spells used. The skeletons still dont bother me, but the cleric could if he had the right spells.
I seem a little bit on the edge here - moving my ac down this low means I'm quite vulnerable to a lot of things. If I bring it up to about 31 (say I have a +8 hermit crab shell) the 6 trolls become 100%, the vrock becomes even easier to catch, 1x fire giant is 100%. It changes nothing about the mindflayers or shadows, and little against the cleric if he's winning on spells. I'm a little better against the blue dragon, but it's still really about the will saves.
I'm almost 0% chance against 2x bebilith, 12 trolls I can beat handily, 2x fire giant is about 54%, 2x vrock is probably not possible due to them able to be on either side - attrition will kill me first probably, 2x blue dragon is probably not happening unless I get lucky, and 4 mindflayers is absolutely not happening. I already lose vs the shadows, and again the cleric is a wildcard.
I may have gone slightly off on one - I like programming, sue me.
Now I need to go spec out my followers...
Oh yeah, I made a backstory, Os.
P.S. I'm going to be carrying around my only 6th level follower I have who will probably be crab1/wizard5 to help with buffing/support, but he will not be offensive as a) i dont wanna lose him and b) his dc will be awful anyway.