So... as one would except, becoming a different species made it hard to do a number of things. Ecto was one of them, unfortunately for Frisk, it meant it was basically back to Baby Town. Though Toriel didn't seem to mind, much to Frisk's embarrassment. In fact, Toriel seemed to enjoy the fact she got to change Frisk's nappies. Saying it was a good bonding experience, Frisk didn't agree but couldn't really do it herself. And thusly was extra determined to learn Ecto as fast as possible. Which wasn't going to be easy, but Sans had a kind of solution. He could ask a friend to rewrite Frisk's code to make her Ecto passive. Though, there was a slight risk it really was the best bet. And Frisk was pretty desperate to get out of her special padded underwear. So she agreed to the idea, and a few hours later. A certain glitch god was in there to rewrite a little bit of code. After that, Frisk realized something, She'd still need to relearn potty training... BUT having passive Ecto would make it easier. 

(Frisk Ecto colors)

Frisk: "My ecto is so pretty, I really like that it glows a bit too. It's like a personal nightlight in a way, though it's to dim for that really."

Error: "You say that but it pretty bright in a pitch black room."

Frisk: "I'm never getting stuck in a pitch black Anything again."

Sans: "Yea, here's hoping."

His job done, Error took his payment, a five pound bag of chocolate bars and left. After that, Frisk made it her mission to do what she said before. 

== Time Skip ==

Frisk's fear of the dark had gotten worse, not better over the two months she'd been alive as a skeleton. Though after comparing notes, the gang could safely say, this wasn't their original Frisk. This made everyone slightly upset but it meant maybe their frisk had been reborn as well. Maybe in some other universe their Frisk was also alive and making new friends. It was a comforting thought, however unlikely it was. Though there was a pressing matter for Frisk, learning magic. She really wanted to learn to make bones and if able, blasters, as well as color magic. The other issue was Frisk's physical health, changing species did a number on her body. And even now no one knew what all that entailed, all they know was she was having a hell of a time regarding the restroom and bathing. Cleaning bones after being used to skin all her previous lives was hard to wrap her head around. As once would except, it wasn't as simple as water and scrubbing anymore. There were a lot of steps involved, and for a Deep cleaning of her bones. It took the help of Slime monsters, which was as embarrassing as it sounded, if not worse. After a bit, it was time to take Frisk to MedicTale, i was the best place for a full medical checkup. And it weren't as well as you'd think.

Doc: "Okay, so being revived multiple times and having your soul travel to multiple multiverses. Really did a number on your physical form. The biggest issue is the incontinence, we can't tell if it's temporary or not. So that's a thing... also for some reason you've not only Determination. But also, Perseverance, Fear, and Lust soul traits."

Frisk: "Is that... bad?"

Doc: "Not really, just unusual for a Monster to have such prominent soul traits."

Sans: "So she's not gonna melt right?"

Doc: "Nah, she's a Reincarnate, her past souls are stabilizing her new form and new soul."

Frisk: "That's good."

Doc: "Yup, 'sides the incontinence you're aces." 

Frisk whined lightly at the mention of incontinence, Sans rubbing her back lightly in comfort.

Sans: "On the bright side, Toriel will be happy."

Frisk: *deadpan* "Yeeeaaa, woot... Mom will have a "baby" to take care of."

Sans laughed lightly and made a few infantile puns about it. Making Frisk laugh a bit. After a bit, the two returned to their AU and gave the news to everyone. As expected Toriel was happy, yet concerned. Which was on point for her, and somehow made Frisk feel better. Though one thing was for sure, this new life wasn't going as expected.