Personality
Dangerous | Sophisticated | Intelligent | Observant | Sociopath
 Evil. If you're looking for a definition for this word in physical form, then you should look no further than Hannibal because there is no better embodiment of the word than this monstrous feline that is no more than an empty husk of a cat.
He is what is known as a sociopath, a cat completely incapable of feeling anything but a very vague sense of emotion, if that, though Hannibal? He feels nothing at all except for maybe an occasional fleeting feeling of curiosity, but he feels no anger, or happiness, or compassion, it's simply impossible for him to feel so. But over his life he has learned to mimic the emotions of others and has practically perfected it over his lifetime and can now appear as if he truly does feel emotions, he can make himself look like the happiest cat on earth, he can make himself look sad, or confused, or any range of emotion that he deems necessary for the interaction at hand. Since he is able to mimic these emotions and fit in relatively well, he is considered a high-functioning sociopath and really, you wouldn't be able to tell that he does feel no emotion. Unless you look into his eyes. That's the one thing that he cannot mimic, and that is the look of emotion that can be found in the eyes when you express any emotion, he can pull a smile and make his voice sound happy, but he cannot bring that look to his eyes. But it's not like many cats chose to stare into them for too long, those fiery pits of hell that seemed to sear into any daring soul that stared into them, picking them apart like a vulture picks apart a corpse.
However, that is not all that there is to know about Hannibal, one must also know that he's a rather sophisticated and well-organized cat and always does things for a reason and will very rarely do something without a reason, he finds it unprincipled, reckless and simply idiotic to work without a reason. Everything he does is very well planned out, sometimes he even spends days planning something, thinking out every flaw imaginable and tweaking so that the flaw could be omitted, working so that whatever it is, he can't be traced to, even though he hardly has to worry about that considering there are very few cats that would wish to snitch on him for anything, not unless they were looking to meet a most violent death. Nonetheless, he is not perfect and not every plan goes through exactly as planned, but he's gotten quite good at having backups for every little slip up that could possibly happen. And if you haven't picked up on it by now, it is safe to say that this dark tom is an incredibly intelligent cat who is specifically intelligent in the subject of anatomy and psychology, often approaching others to study the psychological process of cats with emotions and cats with different sorts of backgrounds, testing their reactions to certain things, often testing patience thresholds, where they get uncomfortable, how touchy they are, storing these notes for every single cat in what he refers to as his 'mind palace' a place in which he neatly organizes all of his thoughts and memories so that he can easily access them and not have a hard time retrieving them. So yes, every cat he's ever met, ever watched, ever spoken to, he's gathered information on them, anything that he can get from conversation or from overhearing others speaking of them, and stored it in his brain for future use. A few times, he's actually used this information to destroy cats, or push them over the edge into insanity in which they simply wander off into the woods and die, unable to provide for themselves any longer. So not only is this tom fit with wiry strength, he can attack you mentally and trust me. This is one cat you don't want in your head.
All in all. There is a good reason why he is arguably the most feared cat in the Dusk Syndicate.