Frisk holds the second feared battalion, making Chara's first. Both of their ways are harsh and deadly, which got the battalion have massive respect from the civilians and other of battalion. Some barely survived the training they give out, just to prove if you're worthy strong or not

The monsters and humans weren't in peace and did a 500 years of war

The only humans in the underground that stayed as the monster's allies/friend is frisk and chara only. They already existed in the underground before a war break down when they reached 15 years, and ed the royal guards at the age of 16.

In the present timeline, frisk is old as fuck while chara being a year older, they're supposed to be around 80s-90s but thanks to reset they can reset their own bodies after finding a glitch in their world that can only reset their body, but not the knowledge and the whole world they're in, but they still have the ability to reset the world. Yes, they'll still be able to hold the power of reset even if they reach the surface, same reason, glitches. Glitches that's not meant to happen, despite chara surviving the poison they ate and Asriel not being able to die, that broke the plot of it's own world, chara being the one who holds and becomes the owner of it's own timeline, and end up sharing it with frisk. they're the one who holds the future, change the path and ways and fix the wrong they once made. They discover this glitch at the age of 19. So if one of them dies, one can reset it's death, which makes them immortal, UNLESS they're stopped and got both of them killed cause no one holds the power but them two.

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I'll put more information when I get more free time!

G'day.