Valkyria Chronicles (戦場のヴァルキュリア Valkyria of the Battlefield: Gallian Chronicles) is a tactical role-playing game released for the PlayStation 3 in 2008. Since it's release, the game has spawned two sequels for the Playstation Portable, as well as an anime adaptation.
What makes Valkyria Chronicles noteworthy from the perspective of Skies of Arcadia is that it is the first instance of Skies of Arcadia characters officially appearing in any form of media since the game's 2003 remake.
Two optional characters named Vyse Inglebard and Aika Thompson appear as optional playable characters. Both are members of Squad 7 and are listed on each other's Like list, indicating that they are friends. Differences in uniforms and weaponry aside, their appearances are otherwise identical to their Skies of Arcadia counterparts. Some of the dialogue spoken by the two contains subtle references to their lives in Skies of Arcadia, such as Aika's line when rescuing a fallen comrade "If you die on me, then I'm taking all your treasure!", or the line for her Nocturnal ability "I ain't scared of the dark! ...just ghosts...". Fina also makes a cameo as the squad's Medic, but is not playable.
The characters' profiles in the game allude to Skies of Arcadia. Vyse's profile indicates he is from a far off land, and once you complete the game his profile is updated to indicate the he and Aika left Gallia in order to seek adventure and treasure. The character profile for Alex Raymond, Vyse's best friend in the game, indicate that Alex was captivated by Vyse's tales of flying and that he accompanies Vyse and Aika on their adventures once the events of Valkyria Chronicles conclude.
In the Valkyria Chronicles anime adaption, Vyse makes an appearance as a member of Squad 5 during the Liberation of Fouzen (episode 13) and Fina is the medic who tends to Rosie (episode 18) and Alicia (episode 21). Aika never appeared in the anime.