The Demon King and Apocalypse Queen of Fairy Tail

Synopsis: What if Natsu got injured before the S-Class Trial and was unable to go and Erza decided to stay with him? What if Natsu ended up as 4th Guild Master? What if Natsu married Erza and had a daughter with her during the timeskip? What if Warrod retired from the Wizard Saints? And what if Natsu and Erza ended up as the 1st and 2nd Gods of Ishgar respectively?

Natsu Dragneel(Pre-Timeskip):

Age: 18

Magic: Fire Dragonslayer Magic

Intelligence: Low C-Class

Skill Level: Mid S-Class

Natsu Dragneel(Post-Timeskip):

Age: 25

Magic: Fire Dragonslayer Magic, Fire God Slayer Magic, Fire Drive, Dragon Force, Demonic Fire Dragon Slayer Magic, END Mode

Intelligence: Mid-High SS-Class

Skill Level: Low SS-Class(No Magic); Low SSS-Class(Base); Low-Mid SSS-Class(Fire Drive); Mid-High SSS-Class(Dragon Force); Peak SSS-Class(END Mode)

Natsu Dragneel(Tartaros):

Age: 25

Magic: Fire Dragonslayer Magic, Fire God Slayer Magic, Fire Drive, Dragon Force, Demonic Fire Dragon Slayer Magic, END Mode

Intelligence: Mid-High SS-Class

Skill Level: Mid SS-Class(No Magic); Mid SSS-Class(Base); Mid-High SSS-Class(Fire Drive); Peak SSS-Class(Dragon Force); Low-Mid Z-Class(END Mode)

Natsu Dragneel(Alvarez War):

Age: 26

Magic: Fire Dragonslayer Magic, Fire Drive, Dragon Force, Demonic Fire Dragon Slayer Magic, Fire Dragon King Slayer Magic Demonic Fire Dragon King Slayer Magic, Fire Dragon King Mode, END Mode

Intelligence: Peak SS-Class

Skill Level: Mid-High SS-Class(No Magic); High SSS-Class(Base); Peak SSS-Class(Fire Drive); Low-Mid Z-Class(Dragon Force); Mid-High Z-Class(END Mode/Fire Dragon King Mode)

Erza Scarlet(Pre-Timeskip):

Age: 19

Magic: Requip Magic

Intelligence: High A-Class

Skill Level: High S-Class

Erza Dragneel(Post-Timeskip):

Age: 26

Magic: Requip Magic, Apocalypse God Slayer Magic, Apocalypse Drive, God Force

Intelligence: Peak SS-Class

Skill Level: Peak S-Class(No Magic); Peak SS-Class(Base); Low SSS-Class(Apocalypse Drive); Mid SSS-Class(God Force)

Erza Dragneel(Tartaros):

Age: 26

Magic: Requip Magic, Apocalypse God Slayer Magic, Apocalypse Drive, God Force

Intelligence: Peak SS-Class

Skill Level: Low-Mid SS-Class(No Magic); Low-Mid SSS-Class(Base); Mid SSS-Class(Apocalypse Drive); High SSS-Class(God Force)

Erza Dragneel(Alvarez War):

Age: 27

Magic: Requip Magic, Apocalypse God Slayer Magic, Apocalypse Drive, God Force, Apocalypse God Mode

Intelligence: Low SSS-Class

Skill Level: Mid SS-Class(No Magic); Mid-High SSS-Class(Base); High SSS-Class(Apocalypse Drive); Low Z-Class(God Force); Mid Z-Class(Apocalypse God Mode)

Gildarts Clive(Pre-Timeskip):

Age: 45

Magic: Crash Magic

Skill Level: Low SSS-Class(Slightly weaker than God Serena)

Gildarts Clive(Alvarez War):

Age: 46

Magic: Crash Magic

Skill Level: Mid SSS-Class

Makarov Dreyar(Pre-Timeskip):

Age: 88

Magic: Titan Magic, Light Magic, Fairy Law

Skill Level: High SS-Class

Makarov Dreyar(Alvarez War):

Age: 87

Magic: Titan Magic, Light Magic, Fairy Law

Skill Level: High SS-Class

Zeref Dragneel(Heavily Restricted):

Age: About 400

Magic: Black Arts

Skill Level: Low SS-Class

Zeref Dragneel:

Age: About 400

Magic: Black Arts

Skill Level: High SSS-Class

Zeref Dragneel(Fairy Heart):

Age: 400+

Magic: Black Arts

Intelligence: Peak SSS-Class

Skill Level: Low Z-Class

Acnologia(Human Form):

Age: About 400

Magic: Apocalypse Dragon Slayer Magic

Skill Level: High SSS-Class

Acnologia(Dragon Form):

Age: About 400

Magic: Apocalypse Dragon Slayer Magic

Skill Level: Low Z-Class

Mavis Vermillion(Alvarez War):

Chronological Age: 119

Biological Age: 24

Magic: Illusion Magic, Great Fairy Spells, Light Magic

Intelligence: Mid Z-Class

Notes: Natsu's title changed from 'Salamander' to 'Demon King'/'Dragon Emperor'/'Fairy King' during the timeskip and Erza's title changed from 'Titania' to 'Apocalypse Queen' during the timeskip. Natsu cured his motion sickness by X791. Before his death, Zeref grants immortality to Natsu and Erza. After the Alvarez War, Natsu gains the title of 'Magic King' and Erza gains the title of 'Magic Queen'.

Low Z-Class = Large Country Level

Low-Mid Z-Class = Continent Level

Mid Z-Class = Multi-Continent Level

Mid-High Z-Class = Moon Level

High Z-Class = Small Planet Level

Peak Z-Class = Planet Level

Low Ultimate Class = Large Planet Level

Low-Mid Ultimate Class = Small Star Level

Mid Ultimate Class = Star Level

Mid-High Ultimate Class = Large Star Level

High Ultimate Class = Solar System Level

Peak Ultimate Class = Multi-Solar System Level

Low God Class = Galaxy Level

Low-Mid God Class = Multi-Galaxy Level

Mid God Class = Universal

Mid-High God Class = High Universal

High God Class = Universal+

Peak God Class = Low Multiversal

Low Almighty Class = Multiversal

Low-Mid Almighty Class = Multiversal+

Mid Almighty Class = High Multiversal+

Mid-High Almighty Class = Low Complex Multiversal

High Almighty Class = Complex Multiversal

Peak Almighty Class = High Complex Multiversal