I calculated their ages when they died...
Rin is 17
Esther is 34
Kies is 79
Friede is 81

I was always wondering how he teleports, but then I remember he can just pause time then walk normally then resume it...

I love the story, the build-up, the depth and the development of each character, the only thing I hate about it is the typical "I just look like a kid but I'm old enough to be fked" especially with Azura and Angelina, with Shizuku... She had one scene like that, but it's good that mc sees her like a daughter, and I hope nothing intimate will happen since she's only 13

I did some digging and found out that Mc is actually 27 years old, also the correct translation of his name was Ludger Cherish (I honestly prefer Ludiger Chelsea), here is some deductions that I did:
1. Bretus Kingdom succession has been happening for 20 years, meaning Mc must have ran away when he was 7, and in the same age frame he met Grander (his master and the only True Blood Vampire).
2. Keeping in mind that Grander have been sleeping for 7 years, the last time he trained with her must have been when he was 20, meaning he have been training under her for 13 years (7 to 20).

Here are the list of all his identities/aliases:
1. Jack the Ripper. Used this alias 7 years ago, probably the first, he used it while serving under the first princess as her shadow, revealed by the first princess, he also used it while raiding Silver Sun. Occupation: Assassin
2. Eugene Voldict. Was probably used 6 years ago, a well-known detective, was briefly mentioned by the soul of the original John Doe. Occupation: Detective
3. Abraham Van Hellsing. Used 5 years ago, a resilient cryptid hunter, well known to have ended the Blood Night, slain the monster Gevaudan, mentioned by both John Doe and Casey, is also mentioned whenever Gevaudan was the topic. Occupation: Cryptid Hunter
4. Arsense Lupin. Used 4 years ago, a well known thief that stole a lot of treasures from the nobles of the capital, mentioned first in a conversation between Mc and Hans. Occupation: Thief