Sebek has a very good memory. Both Trey and Silver compliment him on having “a good memory for minor details” when he is able to memorize the wording of an invitation and recalls seeing Malleus eating French fries with ketchup. Sebek says, “This is critical information for ensuring that Malleus has a pleasant daily life!”
During Halloween we see that he is capable of singing part of an obscure opera that he saw only once as a child. He says, “I still remember that song because it gave me such a fright as a child.”
During Vargas Camp Sebek recites information about lanternblossoms and magestones, earning Riddle’s praise.
Sebek explains that every day he studies until he grows tired and then performs physical training, as “exercise helps to stimulate the brain and improve memory retention!…I can memorize three days’ work of History of Magic material at once.”
Sebek seems to be, physically, very strong, saying that he trains daily so that he may protect Malleus and that, “It is usually my duty to carry large objects in Diasomnia”. During Vargas Camp Riddle comments on Sebek’s brute strength as they set up their tent, when he strides through the mud of a swamp “like it’s not even there” and when he scales a sheer cliff.
Sebek seems very self-confident, particularly during Vargas Camp where he says things like, “I have every confidence in my ability to excel beyond all others!”. Interacting with the player during the event, Grim observes, “There ain’t a tunnel big enough for this guy’s ego”.
Sebek marches into a strange swamp despite Riddle’s warnings, saying, “Spare me your human concerns. I’m not fool enough to let a paltry bog ensnare me”, and argues against abandoning the camp during the Vargas-monster attack as, “that is clearly our worst option…basic deductive reasoning should’ve told you that.”
Riddle calls him out on his condescending tone and Sebek defends himself with, “Excuse me? I said nothing that was incorrect. I was merely stating the facts!” (possibly tying into the fan-theory that Sebek is based on the Sword of Truth)
While attacking the mine monster at the end of the event, he insists that he will take out the creature on his own after declaring, “Weaklings, the lot of you. If you cannot muster any valor, then stand back before you get hurt!”
This confidence hurts his credibility in the end, however, when Riddle and Silver will not believe that he fought a monster at all after he describes it as “a complete and utter pushover”. Sebek declares he wants to report back to Malleus and Lilia instead, as “they would give me the benefit of the doubt!”
He has a voice line saying, “I learned all of this in middle school. Briar Valley is superior even in its educational curriculum”, insinuating he performs well in some classes, but he also says he is “not good with subjects like art. I prefer curriculum with clear problems and solutions.”
Twisted Wonderland Reference Note 