The unnamed battlefield medic who shows up to evac downed units also made her debut in Skies of Arcadia as Fina, though according to her ingame bio she’s actually three people in VC1: the triplets Fina, Mina, and Gina Sellers.
Watching you play Valkyria Chronicles I saw some familiar faces - Vyse and Aika are main characters from Skies of Arcadia. Vyse is kind of a tool but Aika's my homegirl. In said game they fight against the Empress of Valua, and I noticed there's also a city called Valua mentioned in passing during your video.
Oh I thought I’d seen those characters somewhere! I think one of the main dudes behind ValCro had a hand in Skies of Arcadia (it was also published by Sega too if I remember correctly). That’s a neat little thing. Thank you!