[ Gif by choliamb.tumblr.com ]
In the original timeline, after the Avatar and Chrom defeat Validar at the Dragon's Table, the Avatar becomes possessed by Grima and kills Chrom. The Avatar's conscience is completely taken over by Grima, who uses their life force to reawaken his dragon form. When Lucina attempts to escape to the past, Grima follows her to the past in the now dead future Avatar's body. Upon returning to the present, Grima tried to fill the present Avatar with his memories; however the Avatar's Heart of Grima was not strong enough to retain the memories, and this resulted in the Avatar's amnesia. However, the Avatar is occasionally flashed with their future version's memories from time to time, resulting in migraines.
At the beginning of the game, the Avatar is lying unconscious on the roadside, when they are rescued by Chrom's Shepherds. Despite losing their memory, the Avatar has great knowledge of fighting battles and serves as the vigilantes' tactician. Leading Chrom and the Shepherds through a long campaign to protect Ylisse from the Plegia, the Avatar becomes Chrom's trusted advisor for war and ultimately leads to Chrom's victory over Gangrel.
If a female Avatar marries Chrom, she will become the new Queen of Ylisse and give birth to Lucina two years later.
Two years after Gangrel's defeat, Valm intends to invade Ylisse. Chrom and the Avatar decide to talk to the new king of Plegia who is none other than Validar, whom was slain in Emmeryn's assassination attempt. Validar also introduces his hierophant, who looks exactly like the Avatar, and even introduces themselves by the same name. Nevertheless, Validar gives Chrom and the Avatar the necessary provisions to go to war. Later that night, a voice calls to the Avatar. Validar appears and reveals that the Avatar is his child, but flees once Chrom appears. The Avatar shakes off this event as a Risen ambush attacks Chrom's army. After nearly fending off all the Risen, one manages to warp in behind Chrom, but Marth suddenly enters the battlefield and saves him. After Marth reveals that she is Lucina, she shares a moment with Chrom, the Avatar and Lissa where she tells them about the future which she came from: a future where everyone in the army dies. If Lucina is the daughter of the Avatar, Lucina will share a tender reunion with her. Despite this new development, Chrom and the Avatar prepare to travel across Valm to stop Walhart. Occasionally the Avatar is stricken with migraines, but they ignore these headaches and focuses on their goal. After a long campaign, the Avatar leads Chrom's army to victory over Walhart and the Valmese forces.
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Your the first friend I ever had, Your someone I don't want to lose as a friend. Your Smart, Kind, Funny, There's so much, i can't even remember. Thanks.
Your brains and smarts are like mine, but if we put them together, we can make a whole new world.
You are beyond great. Your like, the greatest of them all. I'm so glad I met you.
Your very kind. I feel like your the person to stand by someone's side when nobody is not there to help.
EveryTime I talk to you guys, Something crazy is about to happen. And I like it like that.
Stahl. Your the person that is all ways there when nobody least expects it.
Libra, Your always looking out for me. I thank you for all the kind words you told me over the past months.
Tormod, Thanks for being so kind to me, Your always talking to me, When no one talks to me. I'd really hate it if we'd never talked again. So thanks Buddy!
You always are the best person and best fighter around, I would really like it if we could battle sometime.
Roy, Your here because I felt like putting someone here. //SHOT Just kidding, But you always look out for me. But I might kill you because you keep calling me Grima.
Kyza, thanks for being there for me. I bet you'll find a end to this war as me.
You're the Brother of my Wife. You're very outgoing and cheerful.
Your so awesome. You remind me of my beautiful childhood.
The heat always burns when I'm racing you in Mario Kart 7. I will always Beat you. Just kidding. But thanks for the many races.
We may have started on the wrong foot, But we ended on the right one?
Your so funny, We've been talking non stop about us...And llamas....
Jake, your so awesome. You've always favorite my stuff.
Lucina, you light my fire. And if anything happens to you. I'm right here to talk to you, My love.
< Your my loving daughter. I strive to she how you are in the future.
I'll do everything in my power to protect you, My dear.
Your my sister, Yes, sometimes your a brat but I still love you.
Your my Nephew. I strive to help you into reaching your goal to.
Your my Great-Great-Great-Great-Great-Great-Great Grandaddy. Maybe that's how I got my Tactic Skills.
I'll miss you.
Mother-In-Law, Actually, I'll just call you Mother because you are my only Mother.
I guess I am my own fa-- //SHOT. *Ahem* I mean, You found me on A grass field And now your my Father in law. Thanks for finding me, Dad.