Weak Attacks:
A Combo
A series of slashes.
Forward Tilt
Sephiroth performs a series of attacks with his sword, his fists, and his legs. Like a cross between Ike's Neutral A combo and Snake's Forward Tilt combo. The last strike of this will be the only one with significant knockback.
Up Tilt
Sephiroth swings his sword to shoot out some rather weak air blades diagonally up. This will play very similarly to the CoN Naruto PSA's Kunai attack. Marth's Up Tilt animation would work well for this.
Down Tilt
Ike's Down Tilt would probably be fine, as long as the range in increased.
Running A
Maybe kind of like Marth's.
Allows you to lead into some of your A combos, like so:
Smash Attacks:
Forward Smash
Sephiroth performs a slash similar to Link's Forward Smash animation. But the longer you charge this, the more strikes he performs, which could end up looking a lot like Marth's full Forward B combo, except that he would travel a further distance while attacking.
Up Smash
Pretty much the same as Ike's, just faster and weaker. Fast enough so that his Up Tilt can sometimes set the opponent up for it.
Down Smash
Sephiroth holds his sword up and stabs it into the ground. Very similar to Ike's Neutral B, even the animation can be the same. But instead of fire, there can be that green lifestream stuff, with bits of earth/rocks cracking up, kind of like this:
Of course, this gif is of what his Aerial Down A should be, but the effect is the same.
Specials:
Neutral B
Sephiroth summons a meteor that shoots diagonally down. The longer you charge, the greater distance the meteor travels. For example, just tap B, and it comes down right in front of you. Charge it for a bit, and it comes down like in this gif:
If performed in the air, there is no charge up, and it shoots out a bunch of weaker meteors.
Forward B
Maybe something like Zelda's Forward B. You will control a little shiny thing, but when you let go, it will explode into shadowy spheres.
Up B
Extremely similar to Lucario's. Sephiroth enters a flying state that lasts maybe a second. There will be a brief start-up time where you choose the initial direction you want to go in. You can also attack out of it and use whatever remaining jumps you have afterwards.
Down B
Sephiroth summons a giant pillar of fire around him. The longer you charge, the more pillars there will be, with a maximum of three (the second pillar will be in front of him, the third will be in back). These pillars pull the opponent toward them and keep the opponent trapped for a second or two while burning him (like Ness' PK Fire). Good at racking up damage, but little knockback. Maybe Ho-oh or Entai's fire could work for this.
Grabs:
Grab
Sephiroth pulls his sword back then thrusts it in a given direction (Forward, Up, Diagonally Up, or Diagonally Down), impaling the enemy. This will have a slow start-up time, like Samus', giving the player a chance to choose which direction he will stab in. Marth's Neutral B is a pretty perfect animation for this.
This gif includes his Up Throw
Aerial Grab
Works the same as his ground grab, but it will always stab upwards, and automatically fling the opponent downwards. This could be a good spiking move.
Pummel
Sephiroth twists his sword while the enemy is impaled.
Forward Throw
Sephiroth pulls his sword back and kicks the opponent off of it.
Back Throw
Sephiroth turns around and performs Marth's forward smash animation (or something like it), flinging the opponent off his sword.
Up Throw
Sephiroth flings his opponent upward off his sword.
Down Throw
Sephiroth slams his opponent into the ground, pulls his sword out of him, and then stabs him again.
Aerial Attacks:
Neutral A
Marth's Neutral A in the air could work fine for this. Just up the range.
Forward A
Sephiroth swings his sword downward, very much like Ike's Forward A in the air.
Back A
Marth's arial Back A should work fine, just with increased range.
Up A
Sephiroth rapidly stabs upwards. Little to no knockback, but good at racking up damage.
Down A
What Sephiroth does when he kills a certain someone. Think Toon Link's. It can even use Link's exact animation. One of his main killing moves. If he hits the ground with it, it can cause the earth to crack up and green lifestream stuff to come out.
Final Smash:
Sephiroth enters a state similar to Super Sonic, where he can fly around and perform his attacks (Unlike Sonic, just touching the opponent will not hurt them).
Kinda like this.
His Neutral B becomes a slash attack, and if you connect with it, it leads to a cinematic attack (similar to Captain Falcon's if possible) like this:
Special Traits / Other:
Marth's countering pose could make for a pretty good basic standing pose for Sephiroth. Is it possible to have him walk while holding his sword like this too?
This could be a good run for him:
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