My sheet isn't done, but let's take a look at those encounters...
Fire Giant: doable. He has no specific defenses against what I can do. He hits pretty hard, on 10/15/crit against me in armor (even though natural armor stacks, I think it would be cheating for me to count my Charisma TWICE to armor and then my Strength and Dexterity mods on top of that). It'd be a slugfest for sure, but I think I'd come out on top due to Fast Healing. I can't grapple that well, so draining this guy would be a problem.
6 trolls: I forgot my torch in my other pants. That said, the regular trolls only hit me on a crit and the 6th-level ranger examples needs a 14 or better. Their Will saves are low enough that I can Dominate them one or two at a time and make them fight each other, which gives me some breathing room - the regular trolls would need an 18 or better and the 6th-level rangers would need a 13 or better, assuming I didn't burn through blood charges in order to heighten the DC and/or my attributes, at which point even the rangers would need an 18 to resist.
Bebilith: Immune to poison. Web could be a problem, but... why immobilize me if his attack options are melee? Damage is not particularly high, rend armor could be an issue, but that's assuming he hits me with both claw attacks, which he'd need a 16 or better for. Pumping blood charges in for higher AC would trivialize that issue and render him effectively useless against me.
2 Mind flayers: Immune to the mind blast, plus I can grapple better than they can. It'd be suicidal of them.
Vrock: Could get nasty fast with that telekinesis, but I can't exactly one-shot the guy. Hits about 50% of the time, not much damage to speak of (which is good because I don't have a whole lot of HP). Another slugfest because I sure as hell can't grapple the bastard, but he'd still be in for some nasty surprises, mostly energy drain.
Evil 10th level cleric: I don't think the skeletons would be much of a problem, mostly because they can't hit me, but I don't have a lot of ranged options and this dude is sure to come loaded with plenty of anti-undead artillery. If I sink my teeth in him, though, it's over. Initiative would play a big part here.
A lot of Shadows: I'm immune to their drain and I can hit their incorporeal selves thanks to MoL. Easy peasy.
Young Blue Dragon: Now THERE is an interesting challenge. As I mentioned before, I don't have a whole lot of ranged options, and even though I can fly, I don't have the sheer speed to keep up with this guy. My ability to deal with this would be limited by my ability to ground him, for which there is exactly ONE maneuver I can think of. Otherwise, he's got the edge on me. If the dragon plays it smart, victory is his.