It is revealed during Master Chef that Leona does not know how to use a microwave as he had never had to do so before, but Jack says Leona is the best out of all the sports club members with tech: It is thanks to Leona setting up automatic back ups to the cloud that they did not lose the lighting-related program data for the VDC to Malleus’ restoration magic in Book 5.
Leona has a voice line of, “Sometimes fists speak louder than fancy magic spells. Though brains are the most important thing.”
We have seen multiple examples of Leona possibly knowing more than he is willing to share with those around him: When he sees Grim eating his fourth black stone at the end of Book 3 Leona asks if he is always eating stones off the ground, but when Jack asks if something is wrong Leona responds, “Nah. Don’t mind me.”
This happens again in Book 7, with Leona seemingly suspicious of the Riddle of Riddle’s own dream. Ortho asks if there is something on his mind and Leona responds, “…never mind.”
In this same way Leona chooses not to share what he knows about the mine monster with the teachers when they do not believe that the students fought one, saying, “It’s a waste of time tryin’ to argue with (Vargas).”
Twisted Wonderland Reference Note 