Note | Maybe not the kind of moveset people would want to see for Isaac, but I wanted to put as much stuff from the Golden Sun series as possible.
Speed | Slightly faster than Mewtwo
Jump Height | Slightly higher than Marth's
Grab Range | Same as Lucas's, thanks to his Growth psynergy
Weight | Around the same as Wii Fit Trainer's
Crawl? | Nope.
Wall Jump? | Nope.
Wall Cling? | Nope.
Sidestep | Uses the Cloak Psynergy.
Forward Roll | Warps.
Back Roll | Warps.
Air Dodge | Uses the Cloak Psynergy.
Gimmick | While in the air, Isaac can use to Hover Psynergy to, well, hover. However, unlike Peach's, he will lose his midair jump if he does so. It is also much shorter than Peach's because game balancing is a thing.
Neutral Attack | Two sword slices -> Link's Melee infinite jab -> Stabs forward
Side Tilt | Put his palm forward, releasing energy from it. Similar to Ganon's Neutral Attack.
Up tilt | Releases energy from his hand, which is raides upwards.
Down Tilt | Leg sweep. May trip the opponent if sweetspotted. (Hard to land the sweetspot though)
Dash Attack | Rushes forward to deliver a massive swinging attack with his sword. Based on the Helm/Skull Splitter Psynergy.
Neutral Aerial | Spins around with his sword. The sword itself will burn, dealing fire damage, but has a 1/100 chance of being the Arctic Blade, at which case it will freeze the enemy if sweetspotted (very hard to land).
Forward Aerial | Performs a punch similar to, but not a copy of Dr. Mario's, but with energy, giving it a bigger hitbox.
Back Aerial | Punches behind him, releasing energy from his fist.
Up Aerial | Spins a tall bamboo stick above him. Inspired from the Punji Strike Psynergy.
Down Aerial | Throws a spire below him. Can meteor, but the spire breaks if it goes too far or hits someone. Based on the Spire Psynergy.
Grab Aerial | Uses growth as a grapling hook. The plant he creates can be used to attack as well.
Side Smash | Summons a large and glowing swords and swings it forward, dealing ton of knockback, but also a lot of endlag. Based on the Ragnarok Psynergy.
Up Smash | Raises his sword upwards as it burns. Creates an explosion near the end of the move, which is based on the Fire Bomb Psynergy.
Down Smash | Punches the ground violently, paralysing anyone hit. Based on the Earthquake Psynergy.
Grab | Uses growth as a grapling hook.
Pummel | Headbutt, then knee.
Forward Throw | Violently hits the opponent's torso with his palm.
Back Throw | Throws the opponent backwards, then uses the Force Psynergy to punch the opponent. Amazing KO tool.
Up Throw | Throws the enemy upwards, but very wealky. Then, uses the Thorn Psynergy to deal additional damage and knockback.
Down Throw | Pushes the opponent, making it trip.
Neutral Special 1 - Cutting Edge | Isaac swing his sword forward, creating a watery shockwave with decent knockback.
Neutral Special 2 - Striking Edge | Is basically a multi-hit version of Cutting Edge. Unlike the other two variations, this move is not based on an actual Psynergy.
Neutral Special 3 - Plume Edge | Similar to Palutena's Autoreticle in function, Isaac swings his sword causing a watery explosion to erupt under the nearest player, if not too far from Isaac.
Side Special 1 - Move | AKA the "move" he used in Brawl as an AT. Isaac summons a hand that will push other fighters, without deling any damage. Range is determined by how long you charge it.
Side Special 2 - Force | The hand is now a fist, which obviously deals damage, and charging it affects its strength (damage + knockback) instead of range.
Side Special 3 - Carry | The hand become a command grab, as it grabs the opponent and slams it to the ground (if there's a ground). To avoid overpowered situations, the hand will not fall along with the characters if grabbed in midair, it will simply have a meteor effect upon releasing the opponent.
Up Special 1 - Teleport | Isaac teleports at a chosen direction. Not that hard to explain. Great distance, doesn't have any hitboxes and renders helpless afterwards.
Up Special 2 - Teleport Lapis | Shorter distance, but has hitboxes and can KO at high damages. Named after the item granting you the Teleport Psynergy in Golden Sun: The Lost Age.
Up Special 3 - Warp | Isaac can perform three teleports in a row, each going at whichever direction you want. However, the total distance of these teleports is shorter than Teleport, but longer than Teleport Lapis.
Down Special 1 - Flint | A Djinn appears, increasing Issac's damage and knockback for 10 seconds. Issac's sword glows red to indicate that the effect is still active.
Down Special 2 - Bane | Opponent receives extra poison damage if they get hit by Isaac within 10 seconds after the activation. Issac's sword glows green to indicate that the effect is still active.
Down Special 3 - Sap | Isaac recovers a small amount of damage. Issac's sword glows bkue to indicate that the effect is still active.
Final Smash - Odyssey | Issac summons two giant swords that pierces the match's leader (or second place if Isaac if currently leading) in a X-formation, paralysind said opponent. Then, he summons a third sword that goes across the stage. The third sword OHKOs and will always hit the paralysed opponent.
Side Taunt | Spins a bamboo stick skillfully.
Up Taunt | Looks at the screen and does the "!" emoticon, looking rather surprised.
Down Taunt | Crosses his arms as rocks combine together in front of him to form a tiny floating boulder, which then turns to dust.
Entrance Animation | Isaac beams down using the Retreat Psynergy and unsheathes his sword.
Win Animation 1 | Stands still and has the wind blow through his hair while staring into the distance.
Win Animation 2 | A Djinn jumps out of Isaac with a flash of light. It runs around Isaac while Isaac laughs.
Win Animation 3 | Isaac beams down using the Retreat Psynergy, crosses his arms as the announcer says his name, then teleports away, leaving a Djinn behind.
Lose Animation | Crossed his arms, eyes shut (kinda like Mewtwo's). On the No Contest screen, you can see he summoned two hands to do the clapping.
Yitsul
) - suggested by @A10theHero
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