A Web Serial Novel by Magic Conan 14 (aka Courage's admin) that can be read here. However, in the spirit of Tumblr, the latest chapters appear first. It's an Urban Fantasy story which is explained to be "a D.N.Angel parody and [an original story counterpart] to Stealing Stars (a dead fic) and Best of Luck, Tantei-kun".The continuity goes like this:
Ro.Te.O. The story of two boys, Ryou and Tetsuya, who discover their pasts as angels and have to deal with the baggage that comes with their alter egoes. They're not alone, though - not only do other angels exist, but demons do too and said demons want to bring about The End of the World as We Know It... First published in 2013, unfinished at 10 chapters yet being elaborated on in the revival. Its name was changed to Resurrected Angels in chapter 10 and Rebirth keeps that name.
Crimson. A spinoff to Ro.Te.O written in script format, see a summary of it next to the Show Within a Show entry. First published in 2013, unfinished at 4 chapters and unable to be accessed due to its home tumblr being deleted.
The Future is Crimson. An Alternate Continuity to Crimson. A boy Daichi, his Unwanted Harem, his part-robot butler and resurrected buddy Crimson deal with the normal and not-so-normal in a future where magic is the norm. Complete, started and ended in 2014 at 16 chapters (2 of which are entirely author talk). Unlike its predecessor, it isn't in script format.
Resurrected Angels: Rebirth (found at the same link as Ro.Te.O). An Alternate Continuity of Ro.Te.O. First published in 2014, ongoing.
Resurrected Angels: Memories (found at the same link as Ro.Te.O). The backstories for the Rebirth characters, as well as other tidbits you might never get to see in the main story (under different subsections e.g. Memories of a Time Gone By (poems/Canon Welding) and Memories of Names (on the origin of character names)). First published in 2014, ongoing.
Note that the heading's spelt Ro.Te.O, not the way it appears at the top of the page.There's a character sheet too. Character tropes should go there.
Ro.Te.O and revival!Ro Te O contains examples of: (The revival will only change where noted.)
Aerith and Bob: Averted with the human names since the setting is of the "cosmopolitan" variety and most of the names are actual ones. The angel/demon names are naturally of the "Aerith" type except Gabriel, Raphael, Ariel (in a Memories entry) and Michael.
Age Lift: Rebirth lifts everyone's ages a year, but this is because it debuted about a year later to its original counterpart. The most notable part is when Martin's age is noted just after his first transformation in both versions: in the original he's 16, Rebirth he's 17 but both times he looks 18 as Azrael.
All There in the Manual: All sorts of interesting tidbits can be found if you look through Memories, other Ro.Te.O/Crimson posts and Superhero Project (for Martin, Ryou and Tetsuya only). Tetsuya's a common target for All There in the Manual, as this post proves. The targeting, however, is also justified in that post - Tetsuya is one of the author's favourite characters.
Bishōnen: See Cast Full of Pretty Boys below. Taken to the extreme by Astaroth/Skyrua, who manages to pull Lucifer in with his handsomeness (and it's noted that it's not meant to work on Lucifer), but the biggest offender is Avisel, who is described as putting even Musei to shame...and Musei is feminine-looking.
Cast Full of Pretty Boys: Well, the story was described as a parody of D.N.Angel, so it makes sense to at least have a few...but almost everyone in the cast is a guy.
Five-Man Band: Out of the original's main group: Ryou (type III, although does have the "sense of justice"), Tetsuya (although he's originally The Smart Guy), Katsuo, Martin (although Katsuo's and Martin's roles switch for the revival, as Katsuo uses his fists more) and Kaede.
Four Element Ensemble: Lucifer (fire and a hero), Gabriel (predominantly air and a hero), Raphael (water) and Peter (grass) or Zerachiel (earth). The fifth member is of the dark type.
Four-Temperament Ensemble: The angels of the original have this lineup - Ryou is Sanguine, Katsuo is Choleric, Tetsuya is Melancholic (although he isn't the angel of justice) and Kaede is Phlegmatic. Out of the combos, Yuuki is the Artisan and Satoshi is the Idealist. Sora is another Sanguine.
Elemental Rock-Paper-Scissors: Gabriel to electricity and ice, Sariel to fire, Raguel to ice. Ryou's is water, but there's only water angels at this point in time. During the zombie arc, Gabriel - one of the two water angels - turns on Lucifer only for him to suffer The Worf Effect.
Canon Immigrant: The White Knight, first introduced in a Detective Conan fanfic of the same name. This time, the Knight is part of a family who have their own "Crimson taskforce". In revival!Crimson, the eponymous guy, Daichi, Reika and Hanaka are the immigrants from the original - although a few changes are in place, the biggest being that Daichi and Crimson aren't the same person.