Show me characters who never/rarely smile!

Marcus can keep a straight face for a very long time. 

He an angry punk rocker XD

its pretty hard to get a smile out of her. she does eventually get better at expressing her self, but at first she's quite standoffish and serious 

_{Leona is the polar opposite of her daughter and almost exactly like her mother. It's endearingly comedic. Leona is stoic, apathetic and observant. The only times you'll really see her crack a smile is with her child, who she adores with her entire heart. If anybody can get her to smile, even if it's small, it's her daughter.}

Karma here tends not to smile often. Her resting face often seems to be on the moody side, and tends to exude strong "I don't want to be here" energy. 

Truthfully though? She's just often just so lost in her thoughts or too mentally tired to consider or care about her demeanor. It doesn't help that she's often just processing what she "sees" in people which is also a huge factor in her being either tired or coming off as standoffish. 

It can be quite easy to make her smile however. Food, particularly sweets, are the way to her heart. And boots. She has a major fixation with boots. 

Due to how he was raised, Izar is not very good with expressing emotion in general, and smiling is something he oft forgets is a thing he can do. He's also generally very serious, and due to his work, he rarely has reason to smile too.

They lost the ability to feel emotions during their story. They don't smile much anymore... =(

Adloqu's Personality and Story tabs give the full rundown on why he hardly ever smiles. He does eventually start smiling a bit, mainly thanks to a friend he gets after he's freed.

pale swordsman most likely. not because of anything traumatic directly, but moreso because he's just so serious LOL

Can't blame the poor baby considering all he's been through
https://toyhou.se/19414040.pestilence

man with the most horrific rbf you can ever possibly imagine looks incredibly angry when he's actually just neutral

skin is too stiff :|

grumpy gus, sourpuss, etc etc. tired and jaded old man. the only smiles he lets loose is for his daughter, everyone else needs to work EXTRA hard to even make the corner of his lips twitch