The Tiefling trait "Suicidal": Once per day, as an immediate action, you can make yourself the target of any attack originally directed against a creature occupying an adjacent square.
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While not necessarily feats or traits, the Oath of Loyalty archetype for Paladin allows you to make one ally virtually invincible for a fight instead of smite evil, and such a Paladin could take Variant Channeling: Protection as well. Alternatively, a Cavalier in the Order of the Dragon with the Honor Guard archetype and the Helpful trait can Aid Another to add +8 to an ally's AC, including with Bodyguard.
It is also important to note that you can take the Adopted trait in order to give your human the Helpful trait for free, without consuming your second trait slot. Source.
Then the trait, adopted, is for you :)
Adopted lets you take a trait of one other race. And the Racial Heritage feat lets you take traits, feats and classes of another race. So you could be a Halfling-blooded, Tiefling raised Ulfen and take all of the feats, traits and classes mentioned so far.
At the small price of being a freak. ;)
Check out the halfling feats from the ARG, you can get +6 ac when fighting defensively, and give half as a bonus to ac and cmd to adjacent allies
At the small price of being a freak. ;)
Arnt we all?
If 3rd party material is allowed, the armiger might be a good class to take.
I was gonna suggest this as well. For what your looking for, this is the perfect class, well worth asking if you can use it.