Nicola Adel basically marches to his own tune. After Urias challenges him, he gets goaded to begin to unleash his true power... but then stops and leaves, because he's too hungry to continue.
As Nicola Adel shows Luna around Isunia, a challenger shows up, trying to best him so that he can become a one-man guild too. Nicola, without missing a beat, punches the challenger so hard that he flies off into the distance. Nicola later reveals that this happens on a regular basis.
As Nicola advises Luna to eat more so that she can grow taller, he promptly shoves a full sandwich to the girl's mouth, which led to him receiving a sermon from Marlone:
Marlone: You can't just put things into other peoples' mouths!
Cards — Voice Acting
Despite the general dramatic attitude for most of the game, some of the cards utter incredibly ridiculous lines and that cause some laughs and chuckles:
Summon a Snowman, and you hear "Golly, it's chilly here!" In the past, if you summon multiple Snowmen at once, and it overlaps with itself, resulting in "Golly, it's— Golly, it's— Golly, it's— Golly, it's chilly here!"note Now, the line only plays once as all the tokens are brought in at the same time rather than in sequence. It gets even funnier if the swarm of Snowmen end up being the cause of the opponent's demise.
Grimnir's Badass Boast when played is also a gem, especially in Japanese. If you manage to use him at Turn 10 (which activates his Enhance effect), his Badass Boast is so long that he talks through the entirety of his effect's animation.note Yes, this includes his previous, slower animation.
There exists a mod for the game called the "Summertime mod" which changes the card arts of various cards into summer themed version of their arts. While mostly having female and a handful of male in characters swimsuits as probably is expected, it also has some rather funny inclusions such as Jeno, Blood Wolf, Tart Man and the common Skeleton.
"I'll put in my hours, but don't expect me to clock in any overtime. What... I dropped something, you say? O-oh, that's the HaZeus fanfic I wrote! Y-you're a fan too? Omigosh, let's gush! HaZeus or Zeudes? I just can't choose my OTP!"
Elegance in Action, the title of the card mixed with the art of a maid stumbling around is just snark at its best. The description just seals the deal.
"Visitors to the mansion always depart with an item gifted in apology."
While most of the funny lines come from the cards, the alternate Shadowcraft leader Mordecai manages get a little gem with his sorry emote. It's something especially amusing hearing a skeletal knight saying sorry in such a silly and childish tone.
Your opponent establishing lethal for their next turn and emoting over it? Rude. The same opponent getting eliminated by a card they didn't expect? Gratifying.
There is an inherent humor with several Baleful Polymorph effects, largely due to what the cards get transformed into. Transforming the mighty Bahamut into a much less harmful Snowman or a Flame Rat is a lot more humiliating than destroying or banishing it.
There has been a recorded case where someone won a game by milling the opponent's cards straight to zero.
Much more common but less dramatic are cases where a player has replaced their deck with Prince of Cocytus but left a Vile Violet Dragon on the board. A crafty opponent can deal chip damage to Vile Violet enough times to force the opponent to draw out their small deck. Winning a game this way is often an Awesome Moment for the player.
Episode 14 is one of the sillier ones — Hiiro squares off with the eccentric Marcel, and he's left baffled by the chef's behavior. Even Marcel's entire deck is ridiculous, as a mostly neutral deck with a cooking theme using sillier cards like Hamsa, Ultimate Carrot, and Humpty Dumpty.