When Kalim talks about books without illustrations being hard to read, Deuce agrees. During the lantern event Jack comments on how they may be trapped in the school library for months and Deuce responds, “I can’t stay in here that long! Spending months surrounded by this many books would end up overloading my brain!”
Riddle asks, “How much of an aversion to books do you have?!”
Deuce attempts to read while they are there but falls asleep, saying, “I read some of it, but I didn’t get very far…”
Deuce says that acting without thinking things through is his biggest weakness, which we see on display in the prologue when he throws Ace at a chandelier to catch Grim only to later reflect, “I probably should have come up with a way to soften your landing after you caught him…”
The example that Deuce gives is when, after hearing that Trey was intending to go out and buy cheese, he volunteered to go instead and went to the school store without asking what kind of cheese Trey actually wanted. He returned to the dorm with bite-sized cheese only to learn that Trey actually wanted cream cheese.
It is for this reason that Deuce selects Scarabia as the dorm he would go to if he had to transfer out of Heartslabyul, saying, “if I could get a handle on Scarabia’s spirit of mindfulness, it might help me screw up less…at least, that’s what I imagine would happen!
Despite this appreciation for Scarabia’s spirit of mindfulness when Jamil encourages Deuce to pack certain things for their trip to Fleur City, just to be safe, Deuce calls him paranoid.
Deuce does not bring anything that Jamil recommends with him to Fleur City (except for an extra bag, which breaks).
Ultimately Jamil uses the same scarf, soap and cotton swabs that he recommended that Deuce bring along with him in order to get a chocolate stain out of Deuce’s shirt during the trip.
Deuce says he wishes he were able to think ahead during White Rabbit Fes.
In another example, Deuce gets Floyd a “Blastcycle Passenger Ride Ticket” for his birthday, failing to specify how many times the ticket can be redeemed or that it was only meant for Floyd to use: loopholes that Floyd seems to intend to take advantage of.
Even during the White Rabbit Fes event Deuce’s bully observes, “You don’t think through decisions much, do ya…”
Azul also cautions Deuce about needing to think before he acts, or he is “going to make a terrible mistake one day.”
In Book 5 Deuce decides that his “hard head” might actually be his strength, though it is also what frustrates him about himself: “I’m not smart enough to think about a lot of things at the same time. But that also means that once I put my mind to something, I can make a beeline for the goal without stopping…my weakness can be my strength.”
Twisted Wonderland Reference Note 