What can you tell us about them?

I believe I originally built her as a paladin 2 / Bard X, with her originally being part of an order of knights that worshipped a sun god, though she struggled with following their tenets to perfection. While stopping some cultists there was an incident which ultimately resulted in her being exiled from the order, and branded, literally and figuratively. That had a downstream effect of a lot of people assuming she had to be evil or a monster, or otherwise untrustworthy, so she mostly lived in a self-imposed exile, only really interacting with people from the nearest town when they needed brute stretngth or someone expendable.

Define "branded". Does that mean she was turned into a Gnoll in this case?

no. Literally branded as in with a hot iron. And Metaphorically branded because people would see her and be "oh thats the person who was branded and removed from a well known order of knights, she can't be a good person if they kicked her out." and as a consequence would avoid associating with her.

What class is Cygnus?

Hmmm, maye Reggie is a gold dragon in disguise? Although I don't see a gold dragon going on adventures! Now a Silver dragon is another story!

Funny enough in the original campaign these two are from, I came up with a convoluted method to turn him into an ancient silver dragon. Since Reggie had the statblock of a Find Greater Steed creature, I intended to use True Polymorph to turn him into a silver dragon wyrmling, which has an equal CR. Then, turning myself into a ghost, I'd use one of its unique features, where once every 24 hours, the ghost can attempt to frighten a person. If the target fails the check by at least 5, they age by 10-40 years. So once a day, they'd try to do this until he aged enough to be considered "ancient". I didn't follow through with it, but it was funny seeing the look on my DMs face when I told them about this insane idea i'd pieced together.

In the original campaign he was a gift to her from the sun god, but because of his overbearingly chipper and bubbly personality combined with him basically being a parody of Dug from Up, the party out of character joked that he was given to her because the sun god didn't want to have to deal with him anymore.

But I guess in the me-canon, there's more to it than that, haha.

LOL! I love how people come up with the wildest ideas to brake the game! One day I will play real time D&D. but for now, I will just keep imagining campaigns in my head and try to finish my map!