You guys really need to tell the rest of the internet what waifu really means.
https://www.yourdictionary.com/waifu
"(fandom slang) A fictional character from non-live-action visual media (typically an anime, manga, or video game) that one is attracted to and considers a significant other."
"From Japanese ワイフ (waifu, "wife"), from English wife."
It's the first entry when I google what a waifu is. And aligns with how I personally saw it used by quite a few people. And what I would expect to get as a rough definition if I asked outside of this thread.
Then slapping it on a barely chibi and more of a child like drawing while also making a 1000-year old dragon joke is bound to lead to some people who don't like it and voice that.