Siegfried always has been one of my FGO MVPs, from the early days of the Orléans Singularity many years ago to the more recent Ordeal Calls, but truth be told, having him face the Dragon of Albion and slay it twice in two epic battles was one of my best memories with him.

That, and of course the rematch/duel against Fafnir in Orléans and having him as my main Servant through the whole Götterdämmerung Lostbelt and seeing him gloriously fell Surtr-Fenrir in the end.