Note: Because of his alternate FS, Isaac may be equipped with the Sol Blade, and his sprite would be equipped accordingly.
Isaac, like Ryu, has two FS choices.
Note 2: Some of the effects in gifs and images differ from what i describe, this is either for smash viability or in the case of effect colors, for the sake of coherence (isaac should mostly revolve around green and yellow, with some red/orange thrown in)
Sol BladeJab ComboQuick Strike: Isaac performs an extremely fast slash with a yellowish slash effect.
Forward tiltAnnihilation: Isaac performs a semi-slow sword attack causing a Kanji to appear based on whether he hit his opponent. The Kanji is different depending on whether the attack was successful.
No hit:
Hit uses the following Kanji instead (in the same style as the "missed" Kanji):
Down tiltThorn: Isaac's sword glows yellow as he slashes along the ground, and small spiked vines rise out of the ground in front of him.
The vines:
Up tiltPlume Edge: Isaac slashes upward and a trail of water follows behind the blade, forming a brief geyser effect.
Forward smashFlint Unleash: Isaac unleashes his favorite Djinni in a powerful sword slash.
Down smashQuake/EarthQuake: Isaac raises the ground on either side of himself in an earthquake. If fully charged, he uses Quake Sphere which is Quake but repeated two extra times.
The source visual effect doesn't work well for us, use some kind of earth/rock effect.
Up smashGrowth/Wild Growth: Isaac summons a group of large vines in front of him, dealing damage to any opponents touched and sending them upward. At full charge it becomes Wild Growth, which is larger and has thorns
Dash attackIsaac attacks with his sword in a similar fashion to his "Attack" command from the games
Neutral airIsaac swings his sword on either side of himself
Forward airCutting Edge: Isaac swings his sword down, creating a red shockwave that travels forward a very short distance
Back airIsaac swings his sword behind him
Down airClay Spire: Isaac summons a clay spire beneath him, which drops on the opponent and knocks back horizontally. Could either be made to combo off of, or have powerful kb instead.
Like this, but only one stalactite falls:
Up airIsaac swings his sword above him
Forward throwNova: Isaac blasts the foe away with a fiery explosion
The following is the explosion for Super Nova, do something similar but with a lot less explosion
Back throwVenus Summon - Isaac throws his opponent back and fires several yellow earth energy projectiles after them, much like ki blasts
Down throwSee back throw. Similar to Fox's down throw, but with Venus instead of a blaster.
Up throwDeath Leap: Isaac stabs the opponent, leaps into the air with them impaled on his sword, and crashes back down creating a purple explosion/shockwave effect
Neutral SpecialRagnarok/Odyssey: A somewhat large magical red-orange greatsword appears above Issac and flies diagonally down-forward, dealing good damage and knockback to anyone hit. At full charge it becomes Odyssey. The sword is much larger, yellow-green in color and travels straight forward (alternatively, it can have the same trajectory as uncharged).
Odyssey (ignore the yellow hit effects, the sword color is what's important)
Side specialMove/Force: Isaac summons a large gloved hand, which moves forward a short distance pushing anything and everything in it's path but dealing little to no damage. Can move items, Bomberman's bombs, anything. Longer charge increases the distance the hand travels.
Optional: The move can be charged. At full charge Force is used, the hand is a fist instead and travels faster dealing more damage.
Down specialGrand Gaia: A magic ring appears just below the nearest enemy's position and after a moment erupts in a reverse meteor shower with medium sized boulders. Deals high damage and very high shield damage, but allows enough time to be avoided with normal mobility before erupting if the opponent reacts quickly or continues their previous movement direction.
Up specialPlanet Diver: Isaac rises up in the air as fire energy surrounds him, then comes down with Planet Diver.
Alternatively, it works like a mixture of Fox and Lucario up B (less angle control than Lucario, less rigid than Fox).
Planet Diver:
Alternatively, use Planetary:
Final SmashJudgement: Isaac summons a large angelic knight wielding a sword and Lion shield. The knight fires a large blue blast from his shield, which hits the stage and erupts in a massive explosion.
Alternate Final SmashMegiddo: Isaac leaps high into the air, his sword glowing bright red over his head. He then touches the blade of the sword into a giant sphere of burning plasma that is summoned off the top of the screen, and slings the searing object onto the target.
Starting:
Plasma ball: