Alrighty then. See, that helps me choose more in a way, since I now know for certain you're playing a spirit who appears to be in his early twenties (as you said, he appears about 21). To fit with him...Hm...Well, it depends on the type of reaction we want my character to have. For my girls...I have some who would be completely oblivious to the fact that he is a spirit, such as my character Chloe who usually works well in that department- she's a complete idiot with such things, and would think him normal in every way, thus just offer him food or something thinking it the norm. One of mine who would be about the age he appears, Miyu, would be uncertain if he were really there or that she was hallucinating since she generally works with psychology and knows a good deal about psychiatric conditions. Most of my female characters are human, though some were either raised by supernatural beings or are from partially supernatural families. That type of bit may also help you with helping me choose. See? There's lots of options because of this.
Since I don't know your preference of my character's gender and utterly forgot to ask as well, I will also note that I do have some supernatural males if that is your preference, though I also have males that fit the same scenarios as female- many humans, some from half-human families, and then some that are plain supernatural. In fact, I have a spirit/poltergeist myself in terms of males. My male age ranges fit the same as my females, and personality wise...If I play my poltergeist, he's oblivious to the fact he's dead and has a fear of ghosts to be quite ironic to his situation, claiming he doesn't believe in them to hide it. Other characters of mine have a clear interest in the supernatural and would most likely simply try to befriend Jonathan because they think it's interesting. But again, that's just examples of my males. I figure telling you this, since I hadn't mentioned an interest in your preference of my character's gender in advance, might be a good idea ^^; You can tell me that when you feel like.