...Well according to my headcanon, yes. But not everyone headcanons Frisk as agender, sssoooo... I'm pretty sure most of the time the answer to this question for me will be "no", considering there aren't many agender characters out there.
[Mar. 19th 2019 Update] _10% procrastinating too much around too many games (Only SV2 on "Osu!", I'm quitting, still trying to ****-mapping) _0.5% ****-mapping _25% enjoying this thread _64% (forced to be) enjoying life _0.5% trying to get back to books I'm supposed to read / translation stuff (minor hobby)