Your fingers become longer and more twig like, your nails are sharp like claws and long, and you can only keep them short by constantly biting them, so they are all jagged and uneven. Your face begins to flatten or become more pointed and sharp, or takes on an almost fish like appearance as your eyes bulge out a bit, your ears shrink. You slowly lose or grow hair in unusual places. Your skin slowly becomes more gaunt, pale, grey, wrinkled, smooth, etc. Never describe what changes took place, never address them directly, just describe your appearance as though that was the way you always appeared. But, slowly over time, as you become more powerful and more in tune with the GOOs you begin to, subtly, change.

Maybe you have an odd tic or you smile a little too eagerly, but you are Human (or Elven, or Dwarven, etc).

At the start of the game you appear mostly normal.

Other than behavior, describe your physical appearance regularly. Humans, or most humans, are so insignificant compared to the Great Ones, so why does it matter if they die for the 'greater good'? Of course, the PCs are significant since they are movers in whatever the GOO has you involved in, and so those they care about are cared about as an extension of them, but the random villagers being killed by gnolls? Yeah, sure, you'll help the team save them, but you don't see why it matters. If you can be Neutral (or Evil, but that's probably not a good idea), some of the above could work. It started off as a cool little gimmick, wound up like a serial killer's collection.) He also cared about looting the foes, since loot is loot. (oWoD Mage: he was a Virtual Adept (Reality Hacker) who believed that all or most-all normal humans were NPCs, so killing was no different from deleting a file on a computer. (Not practical for D&D, but maybe for every type of enemy you face, keep a token to remember it by.) He also liked keeping a token of every enemy he killed. Like, he knew it was preferable not to and that people had hang-ups about it due to their weird beliefs and superstitions, but he didn't really get why they cared if he killed some random normal people. My favorite PC just didn't get why people cared if he killed normal people. Especially if you are trying for GOOlock, I could see some alien mentality being appropriate.

How to play a spooky character dnd