I was thinking about making a character who is an Elan, from the Expanded Psionics Handbook. In short, they used to be humans but through a magic ritual become a psionically inclined race who are a bit in the uncanny valley, because they shift from the "Humanoid" type to "Abberation". Elan normally try to fit in with other humans and lie to them about their status, to not get chased out of town by an angry mob.
Now, I have no malevolent intent towards the party or NPCs: this character just does not want to share what she is in fear of being diven away. As such she passes herself as human. Now, this roleplaying should not be much of a problem (and I could wave away the -2 Charisma modifyer with little trouble), but there are a few issues: Elan are immune to (whatever) Person effects and do not sleep, plus they can spend power points to prevent damage, get bonuses to their saves and a few other things. How can I use these things without being outed to the party right away? The DM's okay with me playing a psionic character, while the others do not play psionics and do not know a lot about it. Could I try to bluff my way to this, while do following my character's rules?
Note that this is just towards the PCs, and not to the players: though if possible I'd prefer to keep it vague to them too (just tell them I'm playing something out of an official book with the DM's consent).