Name: Godzilla
Other Names: Minilla, Godzilla Jr.
Powers: Atomic Beam, enhanced healing, enhanced strength
Weapon: Katana
Forms: Burning, Super
Major Relationships: Mothra (love interest), Anguirus (good friend), Rodan (good friend), Ceaser (rival), Ghidorah (arch enemy), Zilla (mild annoyance)
Theme: Radioactive by Imagine Dragons

Name: Rodan
Other Names: None
Powers: Flight, enhanced healing, speed
Weapon: Twin short swords
Forms: None
Major Relationships: Godzilla (good friend), Anguirus (best friend), Varan (friendly rival), Gigan (rival)
Theme: My Songs Know what you Did in the Dark by Fall Out Boy

Name: Anguirus
Other Names: None
Powers: Enhanced strength, extreme endurance
Weapon: Massive hammer
Forms: None
Major Relationships: Godzilla (good friend), Rodan (best friend), King Kong (sparring partner)
Theme: Headstrong by Trapt

Name: Mothra
Other Names: None
Powers: Flight, web spitting, mild telekinesis
Weapon: Elemental knife
Forms: None
Major Relationships: Godzilla (love interest), Battra (brother), Leo (brother), Megaguirus (rival)
Theme: Keep Holding On by Avril Lavigne

Name: Battra
Other Names: None
Powers: Flight, web spitting, mind reading
Weapon: Elemental Katana
Forms: None
Major Relationships: Mothra (sister), Leo (brother)
Theme: Flawed Design by Stabilo

Name: Zilla
Other Names: Godzilla, Gino (Godzilla In Name Only)
Powers: Atomic fire, enhanced healing
Weapon: Short sword
Forms: None
Major Relationships: Godzilla (stollen identity), Komodithrax (love interest)
Theme: Another Song About the Weekend by a Day to Remember

Name: King Ceaser
Other Names: None
Powers: Extremely high jump, solar beam, martial arts skills
Weapon: None
Forms: None
Major Relationships: Godzilla (past rival), Hedorah (rival)
Theme: Face Me by Edsim and Mahlta

Name: Varan
Other Names: None
Powers: Flight, extreme accuracy
Weapon: Throwing knives
Forms: None
Major Relationships: Rodan (friendly rival)
Theme: Learn to Fly by the Foo Fighters

Name: King Kong
Other Names: None
Powers: Enhanced strength
Weapon: None
Forms: None
Major Relationships: Anguirus (sparring partner)
Theme: Did You by Hoobastank

Name: King Ghidorah
Other Names: None
Powers: Flight, lightning control, enhanced healing and endurance
Weapon: Twin sabers
Forms: Mecha-King Ghidorah
Major Relationships: Godzilla (arch enemy), Gigan (trusted ally), Destroyah (trusted ally), Desghidorah (brother), X (brother)
Theme: Don't Mess with Me by Temposhark

Name: Gigan
Other Names: None
Powers: Flight and laser vision (in second upgraded form)
Weapon: Metal transforming arms, electrical cables
Forms: Upgraded forms
Major Relationships: Biolante (love interest), Ghidorah (leader)
Theme: Caught in a Dream by All Insane Kids

Name: Hedorah
Other Names: None
Powers: Rot, pollution absorption
Weapon: None
Forms: None
Major Relationships: Ghidorah (leader)
Theme: Poison by Alice Cooper

Name: Biolante
Other Names: None
Powers: Plant control
Weapon: None
Forms: None
Major Relationships: Gigan (love interest), Ghidorah (leader)
Theme: Cloud 9 by Evanescence

Name: Destroyah
Other Names: None
Powers: Flight, radiation beam
Weapon: None
Forms: None
Major Relationships: Ghidorah (leader, trusted ally)
Theme: Twisted Transistor by Korn

Name: Orga
Other Names: None
Powers: Enhanced strength
Weapon: Massive metal claws
Forms: None
Major Relationships: Destroyah (creator)
Theme: Animal I Have Become by Three Days Grace

Name: Muto
Other Names: Femuto
Powers: Speed, EMP
Weapon: Knife
Forms: None
Major Relationships: Godzilla (hatred), Hokmuto (former love interest)
Theme: Going Under by Evanescence

Name: Kumonga
Other Names: None
Powers: Enhanced endurance
Weapon: Web shooters, claws, spider-tank
Forms: None
Major Relationships: None
Theme: Spiderwebs by No Doubt

Name: Krystalak
Other Names: None
Powers: Crystal body
Weapon: None
Forms: None
Major Relationships: Obsidius (sidekick)
Theme: Before I Forget by Slipknot

Name: Obsidius
Other Names: None
Powers: Magma and heat control, rock body
Weapon: None
Forms: None
Major Relationships: Krystalak (sidekick)
Theme: Burn it to the Ground by Nickelback

Name: MechaGodzilla
Other Names: MechaGodzilla 1
Powers: Enhanced strength
Weapon: Missiles, lasers
Forms: None
Major Relationships: None
Theme: Scary Monster and Nice Sprites by Skrillex

Name: Jet Jaguar
Other Names: Jet
Powers: Flight, martial arts skills
Weapon: None
Forms: None
Major Relationships: Kiryu (teammate), Moguera (teammate), Godzilla (ally)
Theme: Finale by Madeon

Name: Kiryu
Other Names: Godzilla, MechaGodzilla
Powers: Atomic canons, ice beam, atomic beam
Weapon: Mechanical katana
Forms: None
Major Relationships: Godzilla (son), Jet (teammate), Moguera (teammate)
Theme: Born Again by the Newsboys

Name: Moguera
Other Names: None
Powers: None
Weapon: Drill arm
Forms: None
Major Relationships: Jet (teammate), Kiryu (teammate)
Theme: Ladies and Gentleman by Saliva

(Edit: I recently changed a few of the character theme songs, specifically the ones for Varan, King Kong, Hedorah, Biolante, Krystalak, Jet Jaguar, Kiryu, and Moguera.)

(Edit: I added a cast to this chapter. The cast consists of voice actors I imagine could lend their voices to the characters. Check it out, you may recognize the voice of your favourite character!)