I should have elaborated. Of course I'd love to see Towa return in every future Trails game. She actually already does have a great track record in the series already. Since her debut in Trails of Cold Steel, she
>Has appeared in all four Cold Steel games
>Appeared in a separate Falcom game Tokyo Xanadu
>Was retroactively included in the modern port of Trails to Azure
>Skipped the first Trails through Daybreak, but shows up in the second.
>Included in the mobile gacha Cold Steel Northern War
>Appears in the latest Trails game Trails beyond the Horizon, releasing early next year.
The only Trails arc that Towa isn't present for is the very first one, Trails in the Sky. And hey, with the Sky 1st remake coming we never know if Falcom will pull a fast one and retcon her in somehow!