One common theme could be adventure. Since it's set in an 'underground' setting, there might be elements of exploring the unknown, facing challenges and obstacles. Another theme might be the relationship between rex and the devilartemis characters, which could involve friendship, rivalry or even some form of cooperation.
Well, I'm not that familiar with specific 'rex in the underground devilartemis fanfiction' stories. But you could try searching on popular fanfiction websites like Archive of Our Own. They usually have a wide variety of fanfictions and you might be able to find some good ones related to this there.
Definitely Scooby - Doo. They have a special bond. Besides, Fred might join in. Fred is good at building traps, which could be useful in the 'war' situation. Daphne could also be there. She has a lot of courage and could support Shaggy when he's in a tough spot.
Well, they could start off as reluctant allies. Shrek might not trust Shaggy at first because he seems so skittish, and Shaggy is afraid of Shrek's appearance. But as they face challenges together, like fighting off a common enemy, they begin to respect each other. For example, when a group of witches tries to capture them both for their own evil plans, they have to rely on each other's unique skills. Shrek's brute strength and Shaggy's quick thinking and ability to find hiding places.
Shaggy dog stories are long, rambling tales that often have an unexpected or anticlimactic ending. They are known for their elaborate setups and humorous twists.
A shaggy dog story is a kind of humorous tale that often has a long and complicated setup but ends up with an anticlimactic or unexpected and often unimpressive conclusion.
Well, in this novel, Shaggy Dog is indeed alive. The story doesn't have any events that lead to his demise. His presence continues throughout the narrative.