Permissions
What species is your character? Human.
Would other characters be able to sense your character's species? I don't see why not.;)
Is there anything strange in your character's blood, DNA, etc that other characters might be able to sense? Kimblee carries a Philosopher's Stone on his person at all times. In the FMA universe, stones are made using the energy from human souls, so people who can sense soul energy or chi - like the Xingese characters - should be able to pick up that something is "off" about his presence.
What does your character's soul look like? Probably a dark labyrinth.
Is it possible to read anything from your character's soul? One might be able to tell that he's not quite what he seems, but they might not be able to tell exactly what that means.
What color is your character's soul? Crimson, of course!
Does your character have an ability that others might be able to sense? The presence of the aforementioned Philosopher's Stone.
Can your characters thoughts be read? Possibly, but it would probably not be easy.
Is it possible to communicate with your character through telepathy? I don't see why not, as long as the other participant is telepathic.:)
Is it possible to see what your character is doing through psychic powers? Probably so.
Is it possible to sense your character's location somehow? If that person has the ability to do so, I don't see why not.
Is it possible to sense your character's emotions? Probably not. Kimblee guards his emotions and is able to keep them fairly under control. It would be a challenge to crack the shell he's constructed.
Does your character have any mental walls or defences up? Yes, yes he does. He's well aware his way of thinking isn't deemed "normal" by most people, so he's adopted a persona to appear more socially acceptable.
Can your character be mind-controlled? Perhaps, but not easily.
How do you feel about 4th wall breaking? If it works, why the heck not?
Is there something specific that you don't want anyone to know about your character? Only people with soul-sensing abilities - or those who know he has it (like Edward Elric) - should know about the Philosopher's Stone. Most others should not know he has it.
How do you feel about threadjacking? Go for it!
What about spamming your posts? Yes!
How about sudden action threads? Absolutely!
Can your character be imprisoned? He'd rather you didn't, as he's been there, done that.
Is it okay to approach you about hacking private threads? Alternatively, how technologically gifted is your character? Kimblee's a smart guy, but Amestris doesn't have nearly the same level of technology as that aboard the Thor, so he probably wouldn't be the guy you'd approach about hacking.
Has your character died before? Can other characters pick up on this? From the point in canon I've taken him from, no.
Is it okay to kill your character, given the proper discussion/circumstances? I'd rather not, but if the plot is compelling enough, you might be able to twist my arm.;)