Since he's been given a blessing by the God of Mischief, then disguise, escape and stealth skills are necessarily in that order for proper mischief making. Otherwise he'll always being the one getting played, and never the other way around.
For a dude who is going to likely be a God of Tricks in the near future, he seems rather... easy to read from everyone else. Can't wait to see the improvements.
what's the point of hiding his Mana bullet when it's not even a rare skill???? Don't tell me he's the only student who have that? That will be an id**tic plot!!