Aliens
The Alan and Ann storyline was pointless. It was just a filler. The only episode of theirs that I liked was the last one. The R Movie (I love it!) was based on an alien named Fiore, who looks almost identical to Alan. But I liked Fiore much better.
Alan
Alan was another of the converted villains that I like so much. He also started out good and then became evil. I liked what the Doom Tree said: he was just doing what anyone else would've done in their situation. Even though he liked Serena, he loved Ann. I like how he gradually started to convert over the last few episodes before he was completely healed.
Ann
Ann was annoying. She chased after Darien relentlessly. But she really loved Alan, not him. I hated her voice (at least the American one.) She converted too, but not as easily as Alan.
Fiore
The R Movie was awesome! Fiore is such a cool character. He became friends with Mamoru as a child, and never forgot him. Fiore had been lonely, but Mamoru befriended him and gave him a flower. Fiore promised to bring him a flower too, and came back years later with the deadly Kisenian flower. She had warped Fiore's original plan of helping Mamoru to destroying the earth because people there had made him lonely. Fiore really wasn't evil; he was just controlled by the Kisenian flower. At times he would be moved by Sailor Moon's actions, but the flower would take control of him again. He hated Sailor Moon because he was jealous. He wanted Mamoru for himself (I think he was gay) but Mamoru loved Sailor Moon. Finally, he forgave her and converted when he realized that the flower that Mamoru had given him so long ago, was actually one that Sailor Moon had given to Mamoru. He saved Sailor Moon's life by giving her his life energy.
Black Moon