Homunculus

Japanese name:	お父様
Nickname:	Father, Little One in the Flask

Father is the main antagonist of the manga and the second anime series. He is the first homunculus and is the creator of all subsequent homunculi.ch.31 He was originally a shadow-like creature living in a flask, possessing much knowledge regarding alchemy, which he then passed on to Hohenheim. Being created by Hohenheim's blood, Father gained immortality by using a copy of Hohenheim as his new body, centuries before the series' timeline.ch.74 He plans to use Amestris as a gigantic transmutation circle to become a "perfect being".

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