Well, Re:Apotheosis just posted its final chapter and epilogue, so I don't think I'm going to introduce those particular characters...because the new story in the Re:Apotheosis multiverse, The Odyssey of Daiki Yamato, starts in a week and I've got a couple of brand new characters to introduce!
A returning character from Re:Apotheosis, Daiki was a biology student at Osaka University when he was ripped out of his world and transported to a fantasy realm, summoned as the Legendary Hero of the Sword to defeat the Devil King. While there, he was falsely accused of a crime, hunted across the land, met a half-wolf girl named Athena who became his shield and later his fiancee, and finally cleared his name...and then fell out of his world into the world of his creators and got drawn into a war between creations. While there he discovered he was a light novel character created by a woman named Akari Soto, who was padding out his story in the hopes of getting an anime. During the war Daiki's creator was killed, but not before showing him how to use his sword to travel between story worlds. Now Daiki is trying to find his way home to his beloved Athena, and figure out how to create a happy ending for himself, his world, and the people he cares about.
Aquila and Kasumi
Aquila is an independent creation with the powers of a god of destruction. After coming into consciousness, she travelled to the world of her creator, a schoolgirl named Kasumi Agawa, to meet her...only to discover that Kasumi had committed suicide months before. This drove her deep into a pit of anger and despair, and she waged a bloody war against the world of her creator, trying to take their precious stories away from them just as Kasumi had been taken away from her. After brutally and publicly murdering over 140 protagonists in their stories while their fans watched, only to discover that the information stream was just replacing them as soon as it updated, she was convinced to use her once-in-a-lifetime "Miracle" power...which brought Kasumi back to life in front of her, pulled her out of her grief and rage, and ended her war. Five years later, Aquila and Kasumi are living isolated on a world of their own creation when Daiki Yamato crosses into it. Desperate to atone for all the suffering she has caused, Aquila is intent on helping Daiki get home...and terrified that Aquila will get herself killed doing something stupid in her efforts to atone, Kasumi is coming along for the ride, whether Aquila wants it or not.
There is one more character, but he's a bit of a spoiler, so I'm not going to go into details about him here.
And that all starts next week on Re:Apotheosis!
EDIT: The first chapter is LIVE!