Natsu Dragneel, orphaned at a child due to his parents lack of love for him. Natsu dragneel was a Hybrid. He was half Fairy, half four-tier Omega. In addition to that, he has the all mighty power of a dragon. The Fire Dragon King Igneel had taken Natsu in as he wandered in the forests of which he knew so well. His island filled with happiness, Love and acceptance from the people. Natsu has a wandering mind always asking questions about the universe and Space. He couldn't help but love Nature and the sciences. Especially in Genetics.

A Four-Tier has well, four types. Alpha, Omega, Beta and Delta. There's a king Bloodline with the most power in each. It generally called the master Bloodline. The Master of the Master bloodline is generally on the Fay council.
Despite what you may think the Fay council is chill, old as hell, very destructive, and forgiving.

Alphas are dominate in almost every way and they like to keep order. If the Alpha has any sort of Magic or power; its strength. They tend to clash with Omegas.

Omegas can be dominant or submissive. Wild and more unpredictable, thus causing conflict through Omegas and Alphas. If an Omega held power, it would be unbelievable speed.

Betas, a dominant type. Gajeel would be a good example of a Beta or an Alpha. Such as Alphas and Betas are similar. The power would be their naturally good fighters.

Deltas, the more submissive type are more like Wendy. They tend to be more shy and kinder. They would have the power of camouflage.

But not everyone fits into the general traits of their Four-Tier.

Fairys have two types. A fairy and an Elemental fairy. The only difference is that elemental fairies can use the elements.

Natsu, as normal was sitting around in the guild hall eating some pasta while sitting around Lucy, Gray, Gajeel, and Erza.

Wendy had been thinking about something for a while now. She could see only glimpses of what 'full' Fay could see. Dragonslayer magic originated from fae. Thus a fay extension onto her DNA.

Wendy was determined, to change to full fay. As a human with fay extension, it was strange. She wanted to be full fay. She was aware that it was changing her species but, she wanted it badly.

"Natsu?" Wendy sat in front of the full fae dragonslayer.

"Yeah?" He was messily eating a full turkey.

"Is it possible for me to become full Fae?" Wendy put on puppy dog eyes and tried her best to look the most innocent she could. Which was very innocent considering it was Wendy.

Natsu choked on his food. "Your not serious are you?"

"I am!"

"Ummm, but the only thing fay about you is dragon slayer magic right?"

"Yea.." Wendy.

"OI, if you do it to Wendy, do it to me too!" Gajeel butt in on the conversation.

"That..would..be really dangerous." Natsu showed concern for his friends.

"Can't it be done in any way?" Wendy pleaded with big blue puppy dog eyes, trying to make herself as cute as possible for a higher chance of a fine.

"Well...yea...but it'll damage or rupture your DNA." Natsu furrowed his brows.

"Ummm, Is that bad?" Wendy didn't know genetics as Natsu did.

"YES. That could have mutation effects besides becoming fae- PLUS, there is a possibility of death or severe injury!" Natsu chided acting like Carla or a fussy mother.

"C'mon, Natsu!!" Gajeel insisted.

"Gray? Back me up here." Natsu nudged the ice mage.

"If she really wants it-" Gray wasn't paying attention, all he knew is that Wendy wanted Natsu to do something.

"Fine if you don't believe me, what about Porlyusica!"Natsu grabbed Gajeel's wrist and Wendy's waist and pulled and or carried them into the woods where Porlyusica lived.

"Knock some sense into them, please? They want to be fae." Natsu knocked on her door, a little annoyed.

Porlyusica opened the door and sighed. For twenty whole minutes, she lectured the two dragon slayers about why that was a bad and dangerous idea.

But Wendy, when she wanted to be, could be persuasive.

"Fine, you two know the risks. I can only do the merging part, none of the prep."

"Huh, Ironic, I can do the prep." Natsu had given in when Porlyusica did.

"Great. I'm hungry." Natsu left, back to where he was previously sitting next to Gray.
He was reading a letter, which he gave to Natsu.
"This came for you."

"Oh, wait why were you reading it?" Natsu snatched the letter and started reading it.

"Curiosity."

"Haven't you heard of Curiosity killed the cat?"

"Yeah well, I'm not a cat" Gray huffed.

Dearest Natsu,
I want you to come over!! I know what your father and I did wasn't..nice but I want to try to make up for it!! Your father feels guilty even to this day, however, disconnected he may seem. He does care, Natsu.
So do I.
Your father and Silver are still fighting even during council meetings.
Also, I heard that you're in a guild with his son, Gray.
When you come down, feel free to bring him.
With love,
Felicia (mother)

"You coming then?" Natsu asked Gray,

"Huh what? I didn't finish it..." Gray looked at the letter again over his shoulder.

"Oh, um, ok."
"Okay."