this is nagisa in one of the episodes his teacher says he is a natural born assassin becaus he was challenged to fight he first walked up to his target like he was walking to school and when he got up close he sprung in to action pining his target to the ground and raping him self around the target like a python and getting the killing strike with out actually killing him.
this is koro sensei he is originally a human but he has been experimented on and that is why he looks like the picture but he is angry in this picture his real color is yellow and he is a teacher and his students are trying to kill him becaus if they don't he will blow up the earth on the day of there graduation but nothing can hurt him.
This is lucy heartfilia the celestial wizard of the fairy tail guild she has 8 out of the 12 zodiac keys she is also a very talented celestial wizard and she counts all of her keys as allies and not tools she also has leo the lion how in the beginning of the show was a member of the guild as loky how use's ring magic.
this is natsu dragneel a very strong dragon slayer and he is part of the fairy tail guild the things that make him a dragon slayer is he has the ability's to kill the mythical dragon. he has dragon claws to fight with fire dragon lungs to breath fire and dragon scales to dissolve fire he can also eat fire to regain his magic energy