Just a few thoughts that I added on the TV Tropes page for the season 1 finale of DuckTales.
Fridge Horror: It’s revealed that Lena is the shadow of Magica in living form. She was created during Scrooge and Magica’s battle on Mt. Vesuvius 15 years prior to the events of the series, as a result of Scrooge trapping Magica in his number one dime. Lena is her own physical entity, with her own will and personality, and exists just fine alongside Magica’s physical form. Since she is this, and was produced from an extension of Magica, she is, in all relevant senses of the term, Magica’s daughter. The titles of aunt and niece