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Whenever a colonist fires a shot or a burst, he should yell "Reloading!" or "Can't you see I'm reloading ?" like in Killzone.

Better yet, give them entire dialogues taken from different combat games.

When you select them they yell out "AWAITING ORDERS" or "STANDING BY"
Whenever you give a move order, they yell "MOVING" or "GO GO GO"
Whenever they get hit they yell "TAKING FIRE"

Giant insects reproduce at the rate of actual insects

"Magician" background for colonists that allows them to pull rabbits out of hats, fake their own deaths, escape from near-death situations and end up safe at home, and more

One of the telltale signs of mental illness in reality is a degradation in one's ability to take care of yourself.

But there's a difference between actual mental illness and a colonist throwing a tantrum because he/she ate without a table.

Tinfoil Hats: A special downgraded version of psychic foil helmets that don't actually do anything and give the wearer a "Paranoid about repitillian space aliens" mood debuff

A surprise "Spanish Inquisition" raid event that will happen when you least expect it.

"Coolness" skill in your colonists that allows them to do things such as dodge bullets, survive otherwise fatal explosions, shoot more bullets out of a gun than it actually holds (in combat realism mod) and huge boosts to social interaction.

A small chance of a traveling exotic goods merchant actually being Billy Mays

A new mental break called Obsessive Mining, where colonists will ceaselessly mine out random bits of rock around the map

Make a new mental break state:

Restauration of Honor:
Pawns with low mood and who did something bad for the colony like killing a pawn will have a chance to have this mental break, which will get them to pick up something sharp and commit Harakiri / Senpuku to restore honor

Colonists will occasionally commit sudoku instead, where they sit in one place playing number puzzles for hours

Youtuber pawns that randomly narrate the story around them, and occasisionally have over-the-top reactions to completely normal things

DF-style vampiricism. A random settler joining your colony will be a vampire, and before you know it half the colony is found dead and completely blood-drained

I once saw a wild turkey that was high on Luciferium (I dunno where it got it from because I didn't have luciferium on me at the time) go beserk and pick a fight with another turkey.

An option to use non-steel materials for sandbags, allowing such things as wooden sandbags and uranium sandbags.

Boomrat mode, where instead of colonists you control three crash landed boom rats on a world full of people who blow up when they die.