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The thing about Guda, as a person, is that they're weak as shit. Them saving the world isn't indicative to any innate superpower or whatever, it's just that they manage to get on their side people who are extremely powerful and able to go toe to toe with gods. So it is Important To Me that no matter what kind of servant Guda is, they're absolutely useless in the "traditional" ways that kind of servant normally is. A berserker who will not fight. A rider who cannot drive, because even if their legend is tied to that of the shadow border, they never actually used it themself. An archer with no weapon, because they're not the gunman, they're the bullet. A caster who knows no spell. An assassin who can't kill. If you summon Guda as a servant you're gonna have to get creative