@S121
The Neutral Armor doesn't do much. It just acts an empty template for the Icarus and Hermes armor parts. Of which X could upload the parts of Icarus and Hermes armor, in fact X could even mix and match different parts of the Icarus and Hermes armors to get some of the abilities of both.
Now the Icarus Armor:

An armor that focuses on increasing X's offensive and defensive capabilities.
With it X's jump height is doubled. Allowing him to reach places he couldn't before.
Damage he receives from enemy attacks is halved, and he can regenerate from recent (and I do mean really recent) damage he has received if he doesn't do anything (like standing still.)
His X-Buster's power with the Icarus Armor is increased greatly. With his normal shots being as strong as unarmored X's half charged shots, his Icarus Armor's half charged shots being as strong as unarmored X's fully charged shots, and the Icarus Armor's fully charged shot is a very powerful laser.
With the helmet part X gets covered in a small blue aura that can damage enemies whenever he jumps.
When X has ALL of the Icarus Armor parts equipped X gains access to the Giga Crash. A powerful attack that drains all special weapon energy. The Giga Crash is a large wide spread explosion of energy that in-game damages all enemies on screen. In the RP it will basically be a very large surge of energy that damages enemies. In order to have access to this X will need ALL of the Icarus Armor parts equipped. If he has say the helmet, legs, and body parts of the Icarus armor. With the arm parts of the Hermes Armor he cannot access the Giga Crash.
The Hermes Armor:

The Hermes Armor focuses on increasing X's speed and mobility.
With the Hermes Armor X's movement speed and dash speed is doubled with the added bonus of shadow-dashing (allowing him to dash through enemies and even most projectiles.)
The Hermes Armor's X-Buster is weaker, but when charged fires a spread of (Unarmored X's) half charged shots. Basically like a shotgun.
Now the Hermes Armor's body part upgrade is quite different. As in-game it makes X take 2 units less of damage than he normally would. Against enemies that only hit for 1 or 2 units of damage, X is completely invulnerable. Invulnerability period is doubled when X-Drive is in effect. In the RP it will basically just grant X a temporary barrier around him that is activated whenever he gets hit. The barrier can block most attacks. The barrier will last for approximately a minute.
The Helmet Part increases his charge speed, so he can charge up his X-Buster much faster. In X-Drive X's charge speed would be increased even further.
With ALL of the Hermes Armor parts X is granted access to X-Drive which upon activation, X will receive an even further boost in movement speed, jump distance, charge speed and number of charged shots when X fires the Hermes Armor charge shot. X-Drive will last until the weapon energy is drained. Like with the Icarus Armor X cannot access X-Drive UNLESS X has all of the Hermes Armor parts equipped.
These two armors would definitely allow X to mix and match different parts for different upgrades depending on the situation. Granted I will make it to where he has to have someone like Alia or Douglas upload the Icarus and Hermes armor parts into his Neutral Armor.