Yeah I've been spamming your inbox today.
Oh well.

If you know what my head-cannon was for Frisk-Chara-Role-Switch, then this next paragraph should make sense.

So I covered Frisks side of the role, but I haven't covered Chara's.
I feel like taking away her desire to kill would end up making them OOC, so when I really thought about it, for my head-cannon, Chara was abused, and when she fell into the underground after running away from home, she starts to wonder why people would hurt others, and if it would be fun.

When she accidentally killed a monster from the Ruins and it turned to dust, she went into auto-pilot and just shut down.

Chara had woken up in the same spot as before, but with another see through looking child beside them. So basically she found Frisk, and from there, Frisk played the part (quiet well I might add) of the innocent victim.

Chara didn't want to kill them, but with Frisks broken (and fake) sobs in the back of her mind, and how Frisk continuously told her that the pain in her chest was her soul being corrupted by the underground, she ended up killing more.

I always thought that when it was all over, Chara would somehow find out about what was happening to Frisk, and felt like she could relate. So unlike the real deal, I feel like Chara would forgive Frisk.

But that's just my head-cannon.

UNEDITED
UNEDITED
UNEDITED
UNEDITED