These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Mon Suno
Complete Monster: Dr. Klipse, according to his profile description, will likely be this, since his goal is to exterminate the entirety of humanity and remake the world in his image using Monsuno as weapons.
His actions towards the end of season 1 definitely puts him here.
Commander Trey. In only a few episodes, it's established that he thinks Monsuno are mindless beasts who don't feel anything and seems to enjoy it when they're tortured. When Chase Suno gets his father's Monsuno, Trey instantly sees him as a threat to be taken down, killed if necessary, never mind the fact that Chase is still a teenager.
The Bookman, who is all but explicitly stated to have committed genocide on Beyal's people.
And that psychopath Dom Pyro, who stalks the group, kidnaps them one by one, steals their cores and God only knows what he was planning to do to them afterward. His mannerisms and treatment toward Team Core-Tech make him sound like a creepy stalker/serial killer mix.
His second episode reveals he was gonna make them part of his little ''collection''.
Dude, Not Funny!: In episode three of season 2, Jinja mercilessly teases Bren about not having any friends, just two episodes after his signature Monsuno died saving all of them. Cold Jinja, very cold.
Moral Event Horizon: The Bookman crossed it off-screen by killing all the Monks in the Library, with only Beyal and his master escaping.
S.T.O.R.M. appeared to be more or less an Anti-Villain organisation until Charlemagne doomed a whole town as "acceptable" collateral damages to get a wild Monsuno Core.
And if that didn't cross it, she callously murdered Team Core-Tech (or so she thought), and told the captured Jeredy Suno to get over it and move on, plus start working on her Monsuno army.
Nightmare Fuel: DOM PYRO. His tracking abilities are frighteningly good, he has an insane laugh, he's survived TWO buildings falling on him, and he always talks like a predator, right down to calling his prey mice. And worse, he planned to add Chase and the gang to his collection...
And this isn't mentioning how Dom Pyro's Monsuno almost suffered the same fate itself. And apparently the process can't be reversed, judging by his own horrified reaction.
The new Monsuno at the end of "Shadows". The most horrific thing about it is the fact that it's actually JonAce.
Ship Tease: Jinja's had at least one moment with each of the four boys on the team (except Chase).
And then at the end of 'Mirrors', her job-well-done kiss to Beyal sends him into a blushing Heroic BSOD-esqe state, causing Bren to fall over from shock and Dax to irritatedly ask if that's all it takes to get a kiss around here. And when she playfully asks if he wants one too, he reacts all flustered and tries to deny/avoid it... Chase meanwhile, is merely standing there looking amused.