Well, mostly because Jazz asked me to post a complete list of the seasonals we are still missing in A1, and because my former list was incomplete.
If it's a card that isn't released in US yet I will post the respective picture next to it, plus the name. Despite some of them containing A2 card borders, all of those are or will be available in A1 eventually.
Crest Proletariat Knight (A set 7 Crest card, that was not released in US. Instead we got Crest Ranger, which (as you can tell by the border) was an EX card)
Successor of the Shield / Halmira (Fierte's student and successor)
(Valentine's, would be my guess)
Mirror Shield Soldier of Regus
Raging Brawler / Olvaus
Magic Seal Expert / Mikasha
Princess Leia- I mean, Purple Reia.
Undead General / Black Onix (One of Durendal's undead lackies. He apparently gets bishified?)
Observer / Lria
Master of the Demon Spear / Anri (No, Jazz, she is NOT called Henry. Obviously inspired by Assassin's Christmas seasonal)
Mermaid Soldier Human
Child of Destiny / Lamia (Despite JP's insistence, she is not called Ramia, but in fact Lamia, after the daughter of Poseidon and Libya)
True Vision / Reeses
Revolter / Constance
Shrine Knights of Ishtar (Ishtar is Lapierre's successor and the concubine of future Verlaat , this is her special Shrine Knights squad)
Magic Doll -Knight- (Because the card has compression artifacts, and because it is very pretty, I took another minute to dig out a higher resolution picture of both versions, found here
Syakunetsuou (I am not translating this, because I hate translating poetic nonsense.)
2nd SK leader / Liliana (I forgot if she was a generic general, or really Ishtar's second in command, so I rolled with the latter. Again a higher resolution from the Alteil Calendar: Klick.
The Strategist with the Cold Smile / Ivy
Daughter of the Serpent God / Linda
Magic Swordsman / Sistine
Slave of Chaos / Ebreenu
Knight of Frailty / Etoile