There are two timelines happening in the manga: 1. Allen timeline, and 2. Sophie timeline
- On the timeline where Sophie is there, it's Sophie's timeline, the actual timeline. Here, Allen is a cat. Krauss named it "Allen".
- On the timeline when the boy Allen is there, it's Allen's timeline, the actual Allen, and it happened 100 years ago. Sophie hasn't existed, yet.
- The reason why Krauss call Sophie by Allen, because he can smell Allen's blood in Sophie (means, Sophie might have a connection with Allen)
So which Allen whom Krauss is looking for in the Sophie timeline?
Maybe both the cat and Sophie
Krauss adopted a cat and he loves it dearly that he named it based on a student he cares the most: Allen
And Krauss has been swallowed by guild for not be able to save Allen 100 years ago
It messed him up so bad that when he smelled Allen's blood in Sophie, he kinda lost his mind and eventually called Sophie by "Allen"

I‘m so confused..who did trump (kraus) mean exactly when he was „looking for alleen?“ because the cats name was allen, and also the boy who was obsessed with lulumina and in the end he started calling Sophie allen. Was ,,the allen“ a past lover maybe ?