If she pretender does that mean she is not real hephastion? Or is she?

Yup, she didnt have name, and she is not the real hephaestion but sister from the real hephaestion iirc, also known as Iskandar shadow

Well that's relief because I thought we get another genderbend servant 😅

FGO fucked every trace of logic in this character, with saying she's a "fake" Iskandar and then making her a Pretender

She don't have name, she Pretend to be hephaestion, Rumor spread about her as Iskandar, and she accept her self as Iskandar Shadow to show her Loyalty

Not the first time FGO change the class, Voyager was the 1st one ~ as long its have little "thing" thats suit on its class

@CreativeQrow at least Voyager fit the Foreigner class. From what we have about Iskandar's Shadow's, she wasn't pretending to be anyone, she was a second of these people (Iskandar and Hephaestion). I saw nowhere that she was pretending to be them

If i remember correctly, on the anime, she introduce her self as hephaestion & part of Iskandar Army to Waver, and then Waver remember he never see her on Iskandar Army and realize the fact about Iskandar Biography (in Fate Zero) really different with the Real Iskandar thats have big body and tall, instead the Bio more close to "faker"

That's a pretty dumb argument, it's kinda obvious that Waver couldn't analyse every face in Iskandar's NP and memorize them... And just because she introduced herself as Hephaestion doesn't mean it's directly a valuable argument to make her a Pretender. I don't think she tricked the World itself by just saying "call me Hephaestion bro" to Waver or idk who

its the exactly thing what's happening on the series.

requirement to be Pretender

I think you are right at the point, she didnt pretend or trick people on her history, but instead the people was get false representation about her as Iskandar, and spread the false rumor till effect her identity and believe if she is iskandar, she is the one thats take's a curse every time a curse was directly send to Iskandar, is this count as trick the world?

Simply fgo didnt want add more class ~