D

D is the 4th letter of the alphabet.

Design
D's color is a dullish gold.

Quotes
"wanna play? ;)" - D's first words (Comic 26)

"well that's stupid... they're gonna be alive again the next comic... 2 more pointless deaths" (Comic 40)

"ahh, don't stop, keep injecting me with heroin, i love it" (Comic 72)

"what's the matter, C? don't you want the D?" (Comic 90)

Trivia

 * D is the 26th letter to appear in Alphabex.