Heterochromia

Heterochromia is the condition of having two differently colored eyes. Chris claims to be heterochromic (right eye green, left eye blue) and treats the trait as something of a matter of pride, making it a prominent feature of his Gary-Stu renditions. He also boasted of the fact when attempting to charm Anna McLerran, informing her that the condition arose following a case of pinkeye. This detail understandably digusted Anna.

In spite of all this, the condition isn't particularly - if at all - noticeable upon examination of Chris, and the less kind amongst us might presume that it is only mentioned at all for want of any other endearing characteristics.