I'm having to manage so many games that I forget which game has which things in it, so without details (like the class and archetype you're referring to), I can't look this up to be sure, but I'd recommend double-checking the rules. It's very likely that this allows "any Humanoid" - tieflings and aasimar are outsiders with the native subtype, and if that's the case, they wouldn't qualify for the standard list of options for this eidolon.
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