As requested by BlackDragonShinigami, I am going to post to you guys details about Kratos and Rai Sinclair.
Name: Raitsumaru Sinclair
Nickname, or Title: Rai, The Emerald Knight
Age: 18
Gender: Male
Sexual Orientation: Straight
Appearance: Raitsumaru has long, spiky brown hair, green eyes that can turn yellow when using his magic for combat and/or healing others, light skin like Natsu's, and he is slightly muscular. He wears a white sleeveless shirt that's tucked in, an unbuttoned, long green vest that's longer on the back and short in the front with yellow flames at the bottom and a gold Fairy Tail guild mark on the back, black pants, yellow gauntlets with brown gloves that have white flames on them, and brown boots. He also wears a black headband with a gold plate on his head and a silver necklace with a blue diamond in the middle and a red scarf.
Extras: He has a lion tattoo on his right shoulder and a short scar slashed on his left cheek.
Personality: He is very calm and collected most of the time when around others. He gets easily angered at most points when either someone mentions his father or when he sees his friends get hurt. He has always had a great fear of spiders, whenever he sees any kind of spiders, he quickly runs away screaming. Rai is also extremely germophobic, for he tends to carry around wipes around with him at all times. He has an affinity for wolves and lions since he considers them to be both cute, bold, and very cool, since he has two of each as pets. Being a Dragon Slayer, Rai suffers from motion sickness.
History/Bio: Rai was born in a small village in Fiore. His father was a mage in the guild Sabertooth, so he was gone most of the time, and his mother was a florist. When he was eight, his village was attack by a blue dragon that flew in out of nowhere. Rai attempted to fight the dragon but was severely wounded and was given a scar on his cheek in the process. His mother was killed and because he was unable to protect his family and village, his father left to stay with his guild. By the time he was twelve, Rai had a Dragon Slayer Lacrima casted onto him by his now deceased uncle and decided to use his skills to help others in need of help. When he turned thirteen, he joined Fairy Tail. After four years of joining Fairy Tail, Rai earned the title of "The Emerald Knight" after demonstrating his magic by being able to manipulate green lightning with his sword.
Magic: Lightning Dragon Slayer Magic: He has the ability to manipulate lightning and even turn lightning green instead of yellow. He can even eat lightning.
Healing Magic: Rai can use healing magic to heal himself or others when he needs to.
Weapon(s)/ Equipment: Zatch - A silver stainless sword with a golden handle that has been part of Rai's family for many generations. The sword is rumored to have been created by Zeref.
Strengths: Aerial attacks and stealth.
Weakness/ Fears: Spiders
Likes: Helping others, apple pie, wolves, lions, libraries.
Dislikes: Spiders, germs, people who annoy him, watching his friends get hurt, his father.
Guild mark: Right side of chest, black.
Magic circle info: Green with a lightning bolt shape symbol in the middle.
Reason to join Fairy Tail: He wants to help others who are suffering and make Fiore an even safer place than it is now.
Other: Is best friends with Freed Justine.
Name: Kratos Sinclair
Nickname, or Title: The Firebolt
Age: 20
Gender: Male
Sexual Orientation: Straight
Appearance: Kratos has short black hair with yellow bangs, blue eyes, slightly muscular, and has light skin. He wears a long sleeved, dark red shirt with a black falcon on the front of it, black pants, a hooded cape that's black on the front and red on the back, gold wrist guards with a Fairy Tail mark forged in each and red laced boots.
Extras: He wears round silver earrings and a blue metal ring on his right middle finger. Wears a black headband with red and yellow flames on it.
Personality: Even though he is a Devil Slayer, Kratos is very kind to his guild mates and never wants to fight with them. When ever someone hurts his friends, he gets really angry at them and shouts at them. He is warmhearted and caring to his brother and nephew, but shows a lot of hatred towards his father ever since he abandoned them. Kratos can act like a gentleman towards women almost all the time. He even suffers from motion sickness.
History/Bio: When Kratos was 11, he lost his mother to a blue dragon that destroyed his village and his father, Erik Sinclair, abandoned him and his brother. After that, he casted a Lacrima on himself to make himself into a Fire Devil Slayer and set out to find his father. Soon after when he turned 19, he mastered his Fire Devil Slayer magic and decided that he wants to use it to help out people who are being hurt by other Mages. That's when he chose to join a guild to help others in need. He eventually finds his way to Fairy Tail and was unexpectedly reunited with his brother, Rai.
Magic: Fire Devil Slayer Magic, Fire Drive.
Weapon(s)/ Equipment: N/A
Strengths: Hand to Hand combat and stealth.
Weakness/ Fears: Remembering his mother's death, having to fight water mages, flying, and the darkness.
Likes: Helping people, his friends, Fairy Tail, fire, exercising, girls.
Dislikes: Water, dark mages, his old man, people who are causing harm to others.
Guild mark: Red, on left abdomen.
Magic circle info: Dark red.
Reason to join Fairy Tail: The same reason as his brother, to help people.