In Harry Potter and the Cursed Child, the character Delphini is introduced as being the love child of Voldermort and Bellatrix Lastrange.
The wiki cites and there are also other well-researched speculations that suggest that she was conceived in 1998 and before the Battle of Hogwarts, making the conception possibly legitimate of this time line.
However, given the NATURE of 'The Cursed Child' play, whose title could be applied to several of characters and Rowling's penchant for family examinations and plot twist, but more so because it deals with a prophecy, whose origins are not disclosed, and whose characters use a time turner that showcases alternate realities where some characters cease to exist or die at different time/ways (but yet this can also be "fixed"),
I was wondering if it was possible for a character to come exist, from a different timeline, because of time travel?
To Better Explain:
First I am unsure which way time travel works in the HP universe: Does the Harry Potter universe allow for paradoxes (time is a flat circle), where say a character could be created by using a time turner (because a time turner was always going to be used) or are there actually multiple universes where in theory characters that maybe do not exist in all possible timelines could "cross over" into a time line where they never existed? It seems to me from 'The Prisoner of Azkaban' that time is flat circle seems more apt, given that Harry sees himself (but doesn't at first know it). Although Hermione also says this,“Horrible things happen to those who meddle with time, Harry.”, suggesting change is possible and there are consequences...
Here's an example:
So let's say for an example (using the time is a flat circle idea) that someone time travels back in time by using the time turner, even if just casually to experience a past event and in doing so something happens where the character ends up having sex with someone else they never had sex with before and then they return back to THEIR future and discover a bit later they are pregnant...
Could something like this happen within the Harry Potter universe??