Okay, since I seem to have a thing for losing character's skills and having to do them over and sometimes leaving some out, I'm going to make a list right here. Each character, every skill.
Splice The Hedgehog (Other than the Axe kick skill, which I haven't even made for Sonic yet, Splice is complete!)
Spindash
Fire Spindash
Ice Spindash
Needle Spindash
--Each Spindashes pierce defense.
Fire
Fire2
Fire3
Fire4
Flare
Ice
Ice2
Ice3
Ice4
Glacier
Ice Bomb
--Elemental skills. More or less effective on certain enemies.
Speed Up
Haste
--Don't confuse the two. Speed up puts a characters speed up a little, while Haste gives them the actual condition 'Haste' which doubles the speed of the character.
Light Charge
Light Speed Dash
--The two are closely related. Light charge comes first, then Light Speed Dash is available. Only 4 characters can use it. Sonic, Splice, Speedy, and Daz. They all have their --own attributes that can help in different ways. Splice's hits all enemies with Fire and Ice elements.
Ice Breaker
Flame Dive
--Both death attacks. They have a better chance of working depending on which one you use on who.
Flame Barrier
Frost Barrier
--Both protect an ally from Fire or Ice based attacks.
(Skills learned from other characters)
Hyper Speed Up - Speedy The Hedgehog
Endless Bash - Speedy The Hedgehog
Heal - Violet The Hedgehog
Flame Thrower - Kyle The Hedgehog
Axe Kick - Sonic The Hedgehog
--I plan on having characters be able to learn stuff from other characters somehow. I'll have it work out, hopefully.
Sonic The Hedgehog
Speed Up
Haste
Focus
--Focus is only on himself. It raises all stats a little bit.
1-2 Kick
Spin Kick
Spindash
PowerDash
Axe Kick
Sonic Flare
Sonic Updraft
Sonic Eagle
Blue Tornado
Sonic Wind
Confuse
Air Thok
Bounce Attack
--Most of theme come from previous Sonic games. Very few I made up myself.
(Skills learned from other characters)
Endless Bash - Speedy The Hedgehog/Violet The Hedgehog
Hyper Speed Up - Speedy The Hedgehog
--
Miles "Tails" Prower
(No ideas yet)
--I'll think of some.
Knuckles The Echidna
(No ideas yet)
--I'll think of some.
Speedy The Hedgehog
Fire
Fire2
Fire3
Fire4
Fire5
Flare
--Basic fire skills.
Fireball
Speedy Flare
Eruption
Explosion
Blazing Fury
--Fire Attack/Personal Fire skills. He adds his attack power in these skills unlike with the basic fire skills above.
Speed Up
Haste
Hyper Speed Up
--Only support skills he has
Endless Bash
Speedy Combo
Speedy Backflip
Speedy Special
Light Speed Charge
Light Speed Dash
--Personal Skills
(Skills learned from other characters)
Axe Kick - Sonic The Hedgehog
(this is unfinished. I am editing this right now, I posted so I could save it.)