So, I've noticed a lot of people debating Frisk and Chara's genders...
"No, Chara's obviously a girl!"
"No, Frisk has to be a boy!"
"No, both of them are agender! You're misgendering the characters!"
So what are my thoughts on this?
It's stupid, and it isn't possible to "misgender" Frisk or Chara.
Toby Fox has stated that the reason the two don't have genders is so that you can create your own story for the two, they're personality, gender, age, etc. So they are neither male, female or agender canonly. Their gender depends on your canon. And remember that different people have different canons, so if you see a Frisk or Chara that isn't the same as yours, please don't criticize them just for that. I don't care if your Frisk and Chara's genders are different than mine, I won't judge you.
The reason I say that is because I wanted to make a confession; I have a female Frisk and Chara, and I wanted to write stories with them, one in particular on how the Merciless run came to be. And the story pretty much centers around the two of them. Also, another thing I'd like to confess is that I ship Charisk. I have stated this on deviantART in multiple scattered places, and so far, I haven't gotten and hate for it, but these are just two things that I'd like to say before I publish anything. The stories do focus on Charisk a lot, so I thought I'd put that as a little warning before you read my stories regarding Undertale. So those are just a few things I had to get out of the way.