ALL right, here's the low-down:
An Elan psychic warrior / Psion / Pyrokineticist
This guy is going to be a little on the weak side; splitting his power between PsyWar and Psion is going to hurt him, because his manifester level is still considered separate, same as a Wizard 4 / Sorcerer 1 would still only cast sorcerer spells at 1st level of ability. His power points stack, though. A pyrokineticist can be weak if the Player is not careful; all his powers are fire based, and Fire resistance is the MOST common resistance out there. Plus, because they are class abilities, they can't be energy substituted like some of his powers can. If he only goes to Psion 4, then that's max 4 dice of damage any of his powers can do, though personal buffing and utility spells will be very good for him, since he can do so many low-level ones.
- An Aasimar druid who plans to switch over to the shifter prestige class (from "Masters of the Wild") as soon as possible.
The Master of the Wild Shifter, as others have said, is possibly overpowered. Look at the class carefully and see if there are any changes you might want to make. If you stuck with the 3.0 WIld shaping limitations, I think it would be fine, but the 3.5 wildshaping can unbalance this class in short order, because IIRC it gives more than just STR / DEX / CON and extraordinary abilities.
The Aasimar gives a +2 to WIS and CHA, and some elemental resistance 5's. nothing too far unbalanced, but remember that 3.5 Wildshaping CHANGES THE CREATURE TYPE (I believe), so if he shifts, he LOSES those resistances, as well as the light spells once per day.
- An Air Genasi with the swashbuckler alternat core class from "Complete Warrior.
The Complete warrior swashbuckler I have NO experience with. I doubt severely that this guy would be overpowered, and in fact should be a good mobility-specific fighter - but be careful if you throw any stand-up attrition fights at him.
Air genasi's are not overpowered, and in truth I don't think they should qualify for Level adjustment +1, but that's my opinion.
(I think I can handle the halfling cleric, the token sane character concept...
)
OH MY GOD! THEY ARE SO BROKEN!!!!
(Sorry, I figured you just had to hear that at least once in this thread...)
This party need not be boring at all, but in fact one plot thread strikes me immediately - three of the party have extraplanar origins! It strikes me that they are on Faerun for a purpose - someone put the wheels in motion that caused these three to be born - Perhaps the unknown entity that arranged for a celestial to pair with a human, and who arranged a djinni to pair with another human, also
caused the death of the human who would one day become an Elan!!!