First things first; your characters are STUDENTS preparing for their final exam. They are not seasoned SeeDs, their GFs are not all powerful and they are not perfect. Over time, your characters will improve, just remember; this is only the beginning. Characters I deem to be too OP will have to be rewritten. Sorry.
Feel free to mess with the structure of the CS; so long as the info is there, it can look as pretty as you want.

Name:
Age: SeeD candidates can be between 15 and 19.
Gender:
Appearance: Ideally a picture and description, but either or.

Nationality: There's a couple to choose from, but you'll really have to sell it to me if you want a character from Esthar.
Trained At: Which Garden (Balamb, Galbadia or Trabia) did your character do their training at?
Weapon/Combat Style: The fun bit; how does your character kill things?
Limit Break: And what do they do once they've been smacked around a bit? Get creative on this one.

Personality: Is your character a nutter? Anti-social? A kleptomaniac?
Biography: A couple of paragraphs detailing their history, nothing too fancy.

Additional information:

GF: Name your Guardian Force
Appearance: What does your GF look like? Description, picture, mix of the two; it's up to you.

Elemental Affinity: Basic stuff, water, ice, fire etc. Or just None, if you want.
Junctions: Don't bother going into depth here, just say roughly what the GF can do. Don't be too OP.
Abilities: Things like Card, Mug, magic refining etc. Again, nothing too extreme.

Against the backdrop of an invasion of the peaceful town of Dollet by the militaristic Galbadian Republic, six Balamb Garden students prepare for their field test to become members of SeeD, the world famous mercenary company. Led by their instructor Duncan, the group gears up and mount the airships that take them to Dollet.

As the airships approach the mission site, Duncan begins to explain the mission in depth; the students are to destroy an electrical substation just outside the city, then return to the LZ for extraction. However, Syrus notices a second substation near the first and argues that the group must split up to take them both down. As Duncan wrestles with the implications of this, the airships fly into the range of Galbadian anti-aircraft guns, forcing him to make a snap decision. He orders the group to follow Xerox's plan of using deactivated mechs to destroy the towers at the first substation while he takes down the second with explosives and puts Xerox in charge of the mission.

As Duncan splits off from the group, the Galbadians prepare to receive them. Elsewhere in Dollet, a young Galbadian officer named Ace Fiore leads his troops to an abandoned communications tower outside the city. His orders are to repair the tower and defend it, but his squad is less than suited to the task.

The students begin their attack, taking down the first soldiers to reach their drop zone with ease. Xerox and Charlotte begin to move into the rear of the substation, with Syrus, Eika, Riella and Kein attacking head on.

Ten minutes after the candidates began their attack, the main body of SeeD forces begin their landing at Lapin Beach, shattering the Galbadian's first line of defence. With the arrival of much-needed reinforcements, the Dollet army rallies to counter attack the Galbadian positions. The city rapidly descends into a warzone as the Galbadians are pushed back street by street, house by house.

Duncan finally finishes rigging the second substation for demolition, but runs afoul of Ace's troops sent to investigate reports of a SeeD and is captured. His pet bitebug Vinzer manages to escape and sets off to find the students and lead them to it's master. Meanwhile in the city centre, the main force has secured the area and one of their number, a young SeeD named Jericho, is redirected to support the candidates after news of Duncan's actions at the second substation filter back to Garden.

Eika somehow senses her Instructor's fate and goes off mission to rescue him; Syrus, Kein and Jericho are left with little choice but to follow. Meanwhile Xerox and Charlotte are approaching the rear entrance to the first substation when Rue's animal senses tingle. Realising what has happened to Duncan, Xerox asks Charlotte to go ahead and head to communications tower while he finishes the substation alone. Ace's men bring Duncan to the tower and the Lieutenant prepares to interrogate his prisoner. However before he starts, Ace finishes the repairs to the communications tower, activating the uplink. As the Galbadian prepares his tools to interrogate the SeeD, Eika arrives, followed shortly after by Syrus and Jericho.

While the fight rages atop the tower, Charlotte and Xerox split up. Xerox heads further into the substation and uses his skill as a mechanist to destroy it from within, completing the mission directive. Meanwhile as Charlotte approaches the tower, she remembers the tool given to her by Xerox and activates it; paired with another tool it functions as a teleporter, dragging Xerox through space toward her. A short distance away, Kein finally catches up and engages the remaining soldiers at the base of the tower.

The battle atop the tower finally comes to a head, with the SeeDs battered but seemingly victorious until Ace calls in a mighty airship in support. He and his last remaining subordinates jump aboard as the airship's main guns spin up.

The SeeDs and their students flee, powerless against such an opponent, but Jericho leaves a parting gift by freezing the tower controls into a useless lump. They eventually make their way back to where the airships dropped them off to find their rides have returned for them, called by Duncan's emergency flare. They board just in time and the team escape as the airships shift into aquatic forms and dive under the sea. Across the city SeeD begins to withdraw, leaving pockets of Dollet soldiers here and there. With the tower defunct and the Dollet Army re-entrenched within the city, the Galbadians have failed in their objective. It seems as though SeeD was victorious, but in response the enemy razes the city of Dollet to the ground, murdering countless innocents in the progress. The students can only watch in anguish as they are shuttled back to Balamb Garden, unable to stop the slaughter.

After a long trip back to Balamb Garden, the students split up to wind down after the mission. Syrus and Xerox, suffering from fatigue and serious injuries, are taken to the infirmary where Dr Kadowaki plies her trade. Meanwhile, Eika and Duncan head up to Corvo's office so the instructor can give his debrief as Charlotte and Jericho retire to their rooms.

Once the doctor is done tending to Syrus' wounds, he quietly leaves the infirmary. Convinced that the others have found out his secret, he gathers his belongings and attempts to leave Balamb, only to be waylaid at the entrance by a chipper young girl named Mei Song.