Hyper Modes

I only mentioned about the characters' Hyper Modes in their bios so you'd know who got what Hyper Mode (or Modes, if there's more than one). Here, we get into a little bit more detail with them including Final Strike Attack Style (or in X's case with X Fire, Final Strike Attack Style change), Stat Changes, and Sub-Weapon changes (in X's (both hyper modes) and Zero's (only for Absolute Zero) cases). Also, a little bit more details will be told about them here as well.

X
X Fire:
Also known as Cross Fire, X changes going from a Shot style attack to a Combat style attack. He gains signifcant power but loses the ability to attack multiple enemies. Both the unchargeable Shell Buster and the Charge Collider are Fire-typed, but X is neutral.
Final Strike Attack Style: Combat
Stat Changes:

LE Gain	Power Gain	Speed Gain	WE Gain	Damage Changes
50% More LE	50% More Power	25% More Speed	25% More WE each turn	50% Less damage from Shot and Combat Attacks

Sub-Weapon 1: Power Charge
Sub-Weapon 2: Shell Buster
Ultimate Armor:
This is a powerful form that's hard to get but well worth it. X gains incredible offensive powers with the Giga Crush main weapon as well as two powerful sub-weapons. Also, since Ultimate is a flying Hyper Mode, X also has a better chance of dodging Combat attacks.
Final Strike Attack Style: Shot
Stat Changes:

Power Gain	Speed Gain	WE Gain
100% More Power	50% More Speed	40% More WE each turn

Sub Weapon 1: Impact Cannon
Sub Weapon 2: Strike Bullet

Zero
Black Zero:
Zero's shadowy color scheme does more than go with any outfit. His abilities get enhanced giving him better turnaround time. Zero's doesn't last as long as X's, so make sure to spend some Gain Hypers on him.
Final Strike Attack Style: Combat
Stat Changes:

Power Gain	Speed Gain	WE Gain	Damage Changes
100% More Power	50% More Speed	25% More WE each turn	75% Less damage from Fire attacks

Absolute Zero:
Looking for all the world like the powered up form of Wily's other "ultimate" robot (Forte, for those of you who've forgotten about the original Megaman series), Absolute Zero is a devistating form geared towards combat attacks with Ice-typed attacks. Like Ultimate X above, because Absolute Zero is a flyer, he has a better chance of dodging combat attacks. There is another risk with this form. If Zero's LE is at 25% or lower, he will go Beserk, and not even a Cooler will calm him down. The only way to snap him back to his senses is if he hits himself or if his LE rises above 25% before his next turn comes around.
Final Strike Attack Style: Combat
Stat Changes:

LE Gain	Power Gain	Speed Gain	WE Gain	Damage Changes
50% more LE	100% More Power	50% More Speed	50% More WE each turn	50% Less damage from Water attacks

Sub-Weapon 1: Brutal Right
Sub-Weapon 2: Killer Left

Spider
Trickster:
Spider is pretty tricky indeed when he goes into Tricker. While he's basically invunerable to all attacks and status changes, he can't be aided by his allies' moves. Plus, he takes a kick in the Speed stat while cloaked. This is best used when Spider's LE dips low.
Final Strike Attack Style: Shot
Stat Changes:

Power Gain	Speed Loss
100% More Power	25% Less Speed

Massimo
Glint Armor:
Massimo's Glint Armor gives some nice stat boosters including 50% less damage to all elements. Plus, he's all nice and shiny in this form.
Final Strike Attack Style: Combat
Stat Changes:

LE Gain	Power Gain	Armor Gain	Shield Gain	WE Gain	Damage Changes
50% More LE	50% More Power	25% More Armor	25% More Shield	50% More WE each turn	50% Less damage from all Element attacks

Marino
Quicksliver:
Quicksliver is a very well-named Hyper Mode indeed, because the major stat gain for Marino in this mode is Speed. This means that Marino can get in a half-dozen string of attacks before anyone else can interrupt, but you can also use this to boost allies. Because of the speed of Quicksliver, it doesn't last as long as it should, so use it as you see fit.
Final Strike Attack Style: Combat
Stat Changes:

LE Gain	Power Gain	Speed Gain	Damage Changes
50% More LE	20% More Power	200% More Speed	75% Less damage from Water attacks

Cinnamon
Iron Maiden:
Cinnamon doesn't look as innocent when she's in this black maid's outfit. While she does get an increase in her LE and Power, the real unique thing about this Hyper Mode is that all of her active teammates get an additional 25% WE added to their WE gain rate!
Final Strike Attack Style: Shot
Stat Changes:

LE Gain	Power Gain
50% More LE	50% More Power

Axl
Stealth Mode:
Axl's Stealth Mode bears a striking similarity to Spider's Trickster. As such, he gets the same invunerablity as well as the Power and Speed changes. Like Spider's, it doesn't last long, so spend a few Build Hypers on him since it can save your party against various dangers (many I've mentioned earlier).
Final Strike Attack Style: Shot
Stat Changes:

Power Gain	Speed Loss
100% More Power	25% Less Speed