All they're birthdays are miraculously on the same day of May 17th.
For David: NinjaCatPuppet
Because that's his handle for, well... everything. =)
For Buddy: The BuddyBot
He's basically everyone's Buddy. =)
For Clay: ClayFace
Because I left a sticky note on his monitor that asks "Can I call you ClayFace?" Since he reminds me of the batman cartoon character a lot. This is the only unoriginal ALO art. =P