In the closing credits of that episode, Finn and Jake were showed to have survived the big battle and were seen sitting by the lake. The pair, however, are not expected to cameo in "Obsidian" as they did in "BMO." This was confirmed by Muto during Adventure Time's virtual Comic-Con panel this year.
The chest tattoo, which shows Jake surrounded by flowers, certainly has all the hallmarks of a memorial, so by all accounts, it seems as though Jake has died at some point before the events of "Obsidian." It's a heartbreaking revelation for fans who were no doubt looking forward to seeing the lovable, stretchable
Adventure Time fans know that the reason why the world is so messed up with magic is because of a nuclear war that ultimately blew out a huge chunk in the planet, completely changing the nature of reality as we know it. She drops Jake's body in the hole, where it continues to grow, and it fills up the chunk of earth.
Pendleton Ward has stated that Finn got his hat as a baby when he skinned a bear out in the woods. Finn's want for the Evil Bear Hat may have came from a stuffed bear seen in the season 6 episode "The Visitor". The day Finn was born it is white and similar looking to the hat that Finn wears now.
Fionna (previously spelled Fiona and also known as Fionna the Human) is an in-universe fictional character and the gender-swapped version of Finn who was created by the Ice King in his fan-fiction from a strange red glowing inspiration during Ice King's sleep.
Joshua is the father of brothers Jake and Jermaine, as well as the adopted father of Finn. He and his wife, Margaret, adopted Finn as a baby. He speaks in a 1940s Mid-Atlantic accent. He and Margaret, through unknown causes, passed away prior to the events of Adventure Time.
In this episode, Finn begins second-guessing his relationship with Flame Princess, so he builds a giant pillow fort. While navigating it, Finn seemingly falls asleep and dreams that he ends up in a pillow world where he marries a pillow woman named Roselinen (Siegfried) and has two children with her.
In 2013, actor Cory Monteith's sudden death of a drug overdose shocked Glee fans, who knew him as his popular jock character Finn Hudson.
Flame Princess is Finn's girlfriend, in which he confirms by himself in "Puhoy" and her in "Vault of Bones" He first meets her at the end of the episode "Incendium." During the episode, Jake poses as Finn trying to court her because he believed that Finn, depressed after being rejected again by Princess Bubblegum,
Finn gains immunity to electricity. Jake can fix Neptr.
We don't know a single thing about whether or not Susan is Finn's mom, but we know the writers wanted you to think about it. And that's as much evidence that she's Finn's mom as it's evidence that she's Finn's sister, and their mom died delivering her to the hyoomans to be raised Jungle Book-style.
Finn. Huntress Wizard first met Finn in "Flute Spell," where she had came across him playing his flute while nude in a river. After that, Huntress Wizard flirts with Finn by saying "We both know you're totally in love with me." She then accepts another kiss from Finn.
He then decides to stage a fight between the two in real life to see if he can finish the dream. However, during the fight, Flame Princess destroys the Ice Kingdom and discovers that Finn set up the fight. Feeling betrayed, she breaks up with him.
Marceline stopped aging when she became an immortal vampire. It's confirmed that Princess Bubblegum lives longer than humans since she was already over 800 years old at the start of the series. In “Mortal Recoil” she chose to regress to age 13, implying that she doesn't have to age at all.
Martin Mertens, also known as Mr. M, is Finn's biological father. Billy calls him "Dad the Human," similar to Finn's title "Finn the Human."
Later seasons unveil his tragic backstory, revealing he was once a good human named Simon Petrikov who lost his mind, memories and loved ones due to the magic crown giving him his ice powers, but afterwards in the finale episode "Come Along with Me", Ice King regains his memory after being attacked by GOLB.
Finn and Jake live in the post-apocalyptic Land of Ooo, which was ravaged by a cataclysmic event known as the "Mushroom War", a nuclear war that destroyed civilization a thousand years before the series' events.
Humans are a critically endangered species in the Land of Ooo. It is hinted that they were driven to near-extinction roughly a thousand years before the events of Adventure Time, with Finn currently being the few of his kind throughout Ooo. There are other humans though, as discovered in the Islands mini-series.
In the series finale "Come Along With Me," Betty and King Man summoned GOLB to Ooo to cure Ice King of the crown and revert him back to Simon, and retrieve Margles. GOLB was causing mass destruction, and King Man believed Ice King could make Betty get rid of him.
Marceline and Bubblegum Grow Old TogetherIn 2015, Adventure Time released the miniseries Stakes, about Marceline's past. In one particularly sweet scene, we get a glimpse into Marceline's head while she's dreaming and see her and PB growing old together, living happily as a couple.
