Hello! Weaknesses/blood thirst will remain intact. If he could not eat like a human would previously, this would remain the same.

However, as I'm not canon familiar, if there is something in particular that he needs everyday from his own world in order to function (for example: androids needing electricity to recharge, a zombie needing a medication every day to stop them from going feral) then that part of them is 'frozen' by the Aurora for character playability's sake. So for example: if he can't be out in the sunlight without x potion, this could also be something the Aurora would freeze to allow him be out during the daylight hours.

Hope this helps! If you need any other specifics, please don't hesitate to ask!