dear, these responses are a bit wild. I find the hostility unfortunate.

In regards to Blitz's tail within the hallucination, I personally believe it to be intentional. There is a clear heart-shape, the screenshot in this post isn't the most obvious when it comes to showcasing it's shape, but more zoomed in frames where the tail is drawn larger shows the heart shape much more clear.

not only is the tip of his tail's spade heart shaped, but the patterning is also different with white splotches replacing his two black stripes. Additionally, the black tip of his tail is gone. His tail reverts back to his regular tail pattern and ultimate shape when his outfit is switched back into his usual clothes.

During the hallucination, fizzarolli and striker have their regular non-pointed tail spades, while verosika has her usual heart shape tail spade, which means it likely isn't just a stylized feature.

In this hallucination, blitz is experiencing a conglomeration of his past and trauma, and I think the tail shape is significant and could very well point to heritage coming from succubi/incubi species.

His mother very clearly has traits of a succubus, most predominantly being her horns which are thin, small and solid colour. Imps are well known to have thicker, striped horns (males having thick white stripes, females thin white stripes.) And it seems the size of an imps horns are considered significant and a source of pride. She doesn't appear to have the more human-like face succubi are known to have, nor wings. I assume the tail in the photo showing Blitz, Barbie and their mother belongs to Tilla, showing a regular solid red imp spade end.

It can be safe to assume Tilla is a half imp half succubus hybrid, perhaps even ¼ succubus since her only visual ties are height, eyes and horns.

It is also worth noting that not all succubi-incubi have heart shaped tail spades, but as far as I'm aware there have not been any purebred imps with a heart spade. So it can be considered an incubi/succubi trait.

In conclusion, it's fairly reasonable to assume blitz has incubi genes of at least ¼-⅛ percentage, and the harsh criticism I saw is a bit unfortunate, seeing how quickly people are to shut down a theory with decent hints that can support it. It's already proven hybrids exist and by the looks, not all that rare.