>>717979562
She has her own personality. She was created from the excess evil energy in Morrigan when she was young(which might be why Lilith looks the way she does). Over time this energy took a physical form and was imprisoned. Jedah freed them to be his Ally and the reason Morrigan and Lilith are able to merge is because Lilith was always originally a part of Morrigan, and Lilith was just returning to her source.