Here's what we do know about X-Ray's appearance:
* He's a bit gangly: He's described as "tall and skinny" and having "long arms and a long neck". This suggests he might look a bit awkward or clumsy.
* His clothes: X-Ray wears a "too-small" T-shirt and "too-short" shorts, suggesting he might be growing quickly.
* His demeanor: He's portrayed as being quiet and shy, and often seems to be observing others.
While we don't get a detailed picture of X-Ray's looks, it's his personality and actions that truly define him.