Why is Meiko always the bad guy???

This is like asking....
Why does Len always die?
Why is Rin always bossy?
Why is Miku always sweet?

Going off of what zerowakakkoi said, and especially since you're talking about fanfictions and not songs; basically the 인기 headcanon of Meiko is that she's older than most of the other Vocaloids, drinks, and isn't totally a nice person.

Also, Meiko, while a lot of people know her; she's not as 인기 when compared to the other well known 보컬로이드 (Miku, Rin, Len, etc.) so people are probably also 더 많이 willing to make her the villain than other 보컬로이드 that they like, that's kinda my own personal speculation.

Long story short, don't take peoples hate 코멘트 against Meiko personal, it's just like 당신 say; it isn't true. Crypton has not given any of their 보컬로이드 ANY canon personalities, traits, items, etc. there are just things, like Meiko's sake, that are widely accepted headcannons.

I dunno. Meiko is cool

I know right? No matter where I go it's always Meiko being evil. I don't think she's actually evil. I think she's actually a nice person.

I don't really know since she is very motherly and kind , but probably just some idiot haters 또는 Mikutard . I guess she is being the bad guy in KaiMi 팬 fiction right ? . but she wasn't always being a bad guy , for example read some KaiMei fanfic.

They're n00bs. They're going to put a lot of clichés in there, especially Meiko being the bad guy and Miku being the good girl. If 당신 headcanon the opposite, then that's okay. 게시하기 it on the web if 당신 want to.

IDK. Maybe she's not 인기 또는 that the Vocaloid staff don't like her.