Autism Spectrum Disorder
Unable to react or comprehend to interactions such as sarcasm.
Restricted and highly patterned behaviors and interests, often going on major infatuations with one subject for months or years.
Physical clumsiness and odd use of language
Lack of empathy
However, they will not be withdrawn around others (like an autistic individual would), but would awkwardly approach situations.
Having routines that cannot waiver or change.
The cause of this disorder is still mostly unknown, but believed to be somewhat genetic, and the only treatment known is behavioral therapy. It is witnessed that most children do improve their symptoms as they grow into adulthood.