Natsu

How Natsu joined the Tourney
Natsu was a member of the demon-fighting Fu-Ma clan. She grew up under the harsh glares of her fellow ninja, who feared the great demon Arahabaki that was sealed within her. Some even made attempts on her life. Thankfully, another ninja, Sheik, protected and supported her. The young ninja came to love and respect her mentor; though she often disregarded the clan's rules, Natsu always obeyed Taki. But now it had been several months since Sheik left on a mission to the western continent, and Natsu was growing uneasy.

Needle Strike (Neutral)
Natsu will say "Obliterate!!" and throw a slim, almost-invisible needle to attack. They can either travel straight or at an angle (roughly 45 degrees towards the ground), depending on whether Sheik is in the air or not. The special button can be held to add up to 5 more needles, and the needles can be saved for a short time later by pressing the shield button or grab button.

Fireball Shot (Side)
Natsu says "Oh yeah." and throws a fireball.

Vanish (Up)
Natsu vanishes into thin air. Using the Analog Stick, players can determine where Natsu will reappear by tilting in a certain direction.

Bomb (Down)
Natsu says "That's a WRAP." and throws a bomb.

Great Curse of Arahabaki (Hyper Smash)
Based on her Soul Calibur V Critical Edge, Natsu will hold her kodachi in the air and exclaim "Let's get serious...ARAHABAKI!". She will then stick her kodachi into the ground as she summons the Great Demon, sending six wild blasts through the stage and the opponent high into the upper Blast Line.

Blades of Vanquishment (Final Smash)
Based on Taki's Soul Calibur IV Critical Finish, Natsu says "GET LOST!", kicks her foe, and then performs a magical ninja spell in order to triple herself into three. Afterwards, they all slash through the target, say "Demons...", jump into the air, and become one again. Finally, Natsu blasts the helpless opponent into the upper Blast Line with one fatal strike and tells them to "BEGONE!"

Victory Animations

 * 1) Natsu says "That wasn't bad. Not great, but hey!" while raising her hands in the air.
 * 2) Natsu sits down, says "Boo-hoo! Stop your pouting--", and falls asleep before her speech is finished. She starts snoring after this.
 * 3) Natsu is stuck in a sand pit and up to her chest. She says "How come it feels like I'm the loser?" as she tries to get herself out by putting her arms on the surface and pushing, despite failing at every attempt.

Trivia

 * Initially, Taki was going to be included in the game, but Natsu replaced Taki for unknown reasons. Despite this, Cynthia Holloway and Sachiko Kojima, will be used for Kunimitsu's English and Japanese voice actresses, respectively.
 * Natsu's rival is Sheik, the former alter-ego of Zelda.