Phoenixes can give birth to themselves, but dragons are eternal! So dragons.
Pre-arrancar arc Orihime (always jolly and laughing, and hystericly funny) or Post-arrancar arc Orihime ("Kurosaki-Kun, Kurosaki-Kun, Kurosaki-Kun, Kurosaki-Kun, Kurosaki-Kun, Kur..." GIVE ME A BREAK WOMAN!)?