Disclaimer: I don't own Danny Phantom or any character from the series. Jake Fenton/Shadow, Abby Fenton/Abby Phantom, Tori Gray, Matt Foley and Thrasher are characters created by DPcrazy for the fic 'Adventures after a Mistake'.
Gradual Discoveries
Chapter 1: Jack
Jack Fenton was inside his basement/laboratory working on some of his inventions when Shadow suddenly phases inside it like if something or somebody has thrown him in there.
"Shadow, what are you doing here?" Jack angrily demands. Shadow points at the wall he phased and then Skulker and Thrasher phase through it as well. Jack recognizes Skulker.
"You." Jack says in an accusatory tone. "You're the ghost who attacked my son and I at Lake Eerie." Jack says and then pulls an ecto-gun. While he's shooting at Skulker, Shadow starts fighting Thrasher. Shadow carefully blocks every one of her attacks with his ectoplasmic shield while Jack keeps shooting at Skulker. Eventually, Shadow blasts Thrasher and weakens her enough to have her sucked into the Fenton Thermos 2.0. Unfortunately for him, one of two missiles dodged by Jack hits him, forcing him through the Fenton Ghost Catcher. As a result, we now have a full human named Jake Fenton and a full ghost named Shadow. Both of them look at the device and understand what happened since they've heard about that from one of the times they visited their paternal grandparents and Danny had told Jake about the time when he had intentionally used the Fenton Ghost Catcher. However, before they use the reverse mode to become one and the same again, the second missile dodged by Jack destroys the device. Enraged, Jake and Shadow help Jack to defeat Skulker.
"Thank you." Jack says and then notices a teenage human boy next to Shadow. "Hey. What's going on?"
Jake and Shadow point at what's left of the Fenton Ghost Catcher and, after some time, realization clicks in. "What? You were a half-ghost all that time? And please understand that I'm using the correct verbal time. You were a half-ghost. Now you are a full human and a full ghost. But why is the human side of you wearing the cape and the bandana? Weren't they parts of the ghost side?"
"They weren't original results of the transformation." Jake explains. "I added them to my ghost self to avoid being recognized."
"Oh, I wouldn't worry about that." Jack says. "When the world didn't know my son was the ghost boy, even the Guys in White, who already suspected back then the ghost boy was a half-ghost, didn't suspect him."
Jake and Shadow look at each other and think about when Danny saw Shadow's face but didn't recognize him.
"I'm glad to hear that." Shadow says. "But what about my human self? Won't we be able to become one half-ghost again?"
"Don't worry." Jack proudly says. "I'll probably have the Fenton Ghost Catcher restored this afternoon. Until then one of you must attend school."
"Fine. I'll take my human self there." Shadow says.
"Wait." Jack says, worried. "What will people think when they see you together?"
"Don't worry." Shadow says. "I will use my invisibility powers."
"Great idea." Jack exclaims. "But before you leave you must get your cape and your bandana back. What if someone sees your human half wearing them?"
Realizing that, Jake passes them to his ghost self, resulting in an unexpected reaction from Jack.
"What? You're Jake?" It was hard to tell who was more shocked. Jack for discovering one of his grandsons was Shadow, or Jake and Shadow for Jack not recognizing Jake until the teenage boy removed his bandana. Rolling his eyes, Jake confirms it. "Yes, Grandpa. It's me. But please don't tell anyone."
"I don't keep secrets from your Grandma." Jack replies. "I'll tell her what happened here but I won't reveal your identity until you get back from school."
"Thank you, Grandpa." Jake says and then Shadow takes him to school.
Did you like this? At first I would use the Fenton Ghost Catcher in a story where Jake and Shadow would only stay separated long enough for Jack to figure out Shadow is a half ghost but not to learn Shadow's human identity. Maybe I'll do it in another story but now I'll work on this one. My objective here is having one character per chapter discovering Shadow's real identity. I started writing this fic after reading Chapter 43 of DPcrazy's 'Adventures after a Mistake' so the characters who already know Shadow's secret by the time already know it by the time this fic of mine has started.