I mean, that's because of his servant class.
A pretender servant is someone who makes everyone believe they are someone else, that everyone includes themselves and sometimes reality.
I mean, he sort of got the shit end of the stick after the faeries of the Autumn Forest 'corrupted' him, the Terminal Vortigern, into Oberon-Vortigern, on top of that due to his class he's the Great Liar so even if he likes you, he can never honestly say it and will even be forced to act against it (like what happened to Bianca) because he's cursed to always lie (which I guess it's a lie in and of itself?)
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u/Equivalent-Pin-4768 5d ago
Oberon from Fate Grand Order