Aspie (3.5e Trait)
From D&D Wiki
Your character has Asperger syndrome
Prerequisite: At least 8 intelligence
Benefit: Pick one broad area at character creation such as language, crafting or nature you will receive a +2 skill bonus to all things associated with that area for example picking languages allows you to learn 2 extra languages from character creation regardless of your intelligence. This can be applied to a maximum of 4 skills. Your character will also get a +4 bonus to spot checks.
Drawback: The character will get a -8 bonus to sense motive -4 to diplomacy and bluff checks.
Normal: You don't have much problems with looking at social cues.
Special: You have an obsession with an area and know everything about it.
Roleplaying Ideas: You could be a druid aspie with an obsession for nature.