So we know that Rufus Aldebaran lived a hundred years ago, so he’s probably dead now. However, he is clearly seen alive in the intro. I have some theories about how this could be possible:
3. He is not a vampire he’s just high on toxic gas.
4. He is both a vampire and high on toxic gas.
5. He’s the great great something grandson of Rufus who happens to look identical to him because that’s how genetics work.
6. Kissing the dead woman gave him peanut powers, allowing him to travel through time.
9. It’s just Don Paolo in disguise.
8. It’s just Descole in disguise.
11. See 10 but switch the names around.
10. It’s just Don Paolo, disguised as Descole, disguised as Aldebaran.
14. He’s just a fanboy of Rufus, so he dresses up as him.
15. He has a crush on Layton and thinks this will impress him.
16. He’s like Benjamin Button, as he gets older, the younger he looks. (That’s how it goes right? I’ve not seen the film in years)
17. He was dead but true loves kiss brought him back.
18. It’s just a bunch of kids in a trenchcoat.
20. He’s not the real Aldebaran, he’s just a wax sculpture in the museum. At night, the magical Egyptian tablet brings him back to life. If he goes out in the sun he’ll turn to dust.
Well those are the most likely answers. If y'all have any ideas feel free to add on.