I generally don't much like the same player having multiple characters for the express purpose of interacting with one another. It's just so self-serving and lame. That said, if you're talking about a side character, like an NPC that you control that has some involvement in Necro's life/operations, by all means, you don't need a character sheet or anything. That should be listed on the front page as all good, if I remember correctly and I didn't screw up my own formatting.