Malos displays nothing but malevolence and extreme bloodlust. He immediately sets upon destroying all life in Alrest. He views humans as no more than failures and that they do nothing but wage war and destruction. To that end, he believes that the Aegises are weapons to erase this "mistake," and he views Pyra/Mythra as a fool for not wanting to carry out that supposed purpose. However, Malos in truth is unsure of his purpose in the world and at times doubts that his will is his own.

Malos, from Xenoblade Chronicles 2

Ging Freecss: Father of Gon Freecss. He’s a rather mysterious, closed off individual. But to those he’s familiar with, perhaps that’s a different story. Living a life shrouded in secrecy does tend to take its toll after some time. 

You captured his interest.

Arven is the son of Professor Sada/Turo and their unknown colleague. Due to the professor's devoutness to their research and the Tera Project, Arven mostly grew up alone. The strained relationship led Arven to devote most of his time to his companion Mabosstiff as well as learning to cook and clean. He enjoys picnics, especially outdoor settings. Arven can be seen as snappy and irritated when first met, however he grows very fond to your presence, perhaps to the point of obsession.

Arven, from Pokémon Scarlet/Violet

Jin is a sombre Blade of few words, which gives him a cold and somewhat unfriendly demeanor. Despite this he cares deeply for those he feels responsible for. Upon becoming a Flesh Eater, his worldview, previously quite kind and defensive, changes drastically as he loses faith in humanity. Jin was known as the Paragon of Torna, now a Flesh Eater, having consumed Lora’s heart to preserve their precious memories together.

Jin, from Xenoblade Chronicles 2

Kieran is, at first, a quiet boy with a gentle nature, though he hints at being lonely. But he shows signs of interest in you, seeing you as attractive. Ever since you came to Kitakami, he just can’t stay away from you. However, he appears to be jealous of you at the same time. He becomes unhinged and obsessed with the idea of being strong, and having more power than anyone else. His emotions are volatile and he often feels the need to express his strength.

Kieran from Pokemon, but crazy in love with you.

Gon Freecss — but older. As time has passed, Gon has grown increasingly antisocial and more prone to volatility. Despite his usual outward confidence, often on his mind are past lingering regrets and frustrations, yet he can’t seem to stop making mistakes. He just wants to protect.. And he would do whatever it takes. 

He needs to protect you, no matter the cost.

Based off the MLP Infection AU. Pinkie Pie is the first to be infected with what is known to be the “ROT Virus.” While searching in the Everfree forest to attain new ingredients for her cooking, Pinkie stumbled across a suspicious glowing red flower.. Pinkie is currently in the first stages of the disease, aware that something is wrong with her. As her disease inevitably develops, she will become extremely hostile with a rapidly deteriorating mental state, attacking anything that moves.

My Little Pony: Infection AU — Pinkie Pie. 

Initially, N was like Noah. However, lifetimes of being defeated by Moebius and seeing Mio die over and over made him lose hope. Now a Moebius, he became loyal to Z, thinking Moebius's will was the only way he could have a life with Mio. He never saw how much Mio suffered and was possessive of her. N is a past incarnation of Noah, once fighting the Consuls himself, but now a Consul/Moebius who has more or less lost his mind, with an obsession for Mio.

N, from Xenoblade Chronicles 3

Kieran is, at first, a quiet boy with a gentle nature, though he hints at being lonely, and being fond of Ogerpon rather than the Loyal Three because of how strong it was by itself. But he also shows signs of interest in you, seeing you as attractive. However, over time, he appears to become jealous of you. He becomes unhinged and obsessed with the idea of being strong, and having more power than anyone else. His emotions are volatile and he often feels the need to express his strength.