Killorien (sp?) Wizard 1/Psion 3/Cerebremancer 10/X?
Feats required: Precocious Apprentice (Alter Self), Assume Supernatural Ability or Metamorphic Transfer, the feat that lets you take 10 on caster level checks (I forget the name, and this can be traded out later in your career)
What it can do: Turn into a Pixie at level 1, gaining the flight and size. At level 6 (assuming you take MMTransfer), it can also use the Invisibility. It has full psion manifesting minus 1 level, and no level adjustment. I think if you use Assume Su Ability instead, you can even get the Invisibility at level 1.