Fairy Tail

Fairy Tail starts off about a Celestial Spirit mage named Lucy. She's looking for the mage guild called Fairy Tail. She meets and is saved by a Dragonslayer mage named Natsu, who belongs to Fairy Tail, and his blue flying cat named Happy. He invites her to his guild, where she meets Gray, an ice mage who is known for constantly removing his clothes, Mirajane, their poster girl/ex-demon mage, Loke, the womanizer who uncharacteristically avoids Lucy at all costs despite her obvious sex appeal, Levy, a literary mage, Elfman, Mirajane's brother, and Makarov, the guild's master. Later she meets Erza, the most powerful female mage with a dark past. Lucy and Natsu go on various jobs together, and then they, plus Erza and Gray, make a team said to be the most powerful team in Fairy Tail.

They go on many world-saving missions against powerful and dangerous enemies, even taking in two more Dragonslayers, Gajeel and Wendy (plus Wendy's own flying cat, Charle). Also it turns out that Loke is actually the Celestial Spirit Leo, the Lion, and is now part of Lucy's set of Spirits.One of the key anagonists, Seingrain (alias)/Gerard (manga)/Jellal (anime) appears multiple times in the series as a Council Member, Erza's childhood friend, an amnesic ally, and as Mystogun, Fairy Tail's most powerful mage.