In relation to SSBB, Lyndis appears as an assist trophy, Ike and Marth are playable, and Roy...well his theme song is in the game...I think. lol

So yeah...Lyndis could be Roy's mother in Fire Emblem: Rekka no Ken. So...yeah...

Don't you wonder what each character is thinking?

I messed up pretty bad on this pic...too much details...and fixing...and I can't draw boys to save my life...

SSBB and Fire Emblem characters.

Reference from...a lot of different sources