First of all, girls with square faces generally refuse heavy bangs. Qi's hairstyle is out of date. Most girls who are suitable for Qi have round faces, big eyes and delicate noses, which are suitable for Qi. The girl with a square face has the risk of a big face. Leaving Qi makes her head look big and heavy.
However, there are exceptions. For example, if you want to cut bangs, you can choose short hair style to reduce the heavy feeling. You look like Sun Li's short hair. Does her short hair with oblique bangs make the whole person look capable, calm and light? So if you want to cut thick bangs, you can learn from her bangs.
The difference between oblique bangs and qi bangs is that oblique bangs can modify your face, which is especially helpful for girls with imperfect faces. If you don't like the oblique bangs that are too rigid, you can roll them up with a curling iron to increase the fluffy feeling, which will make the overall temperament soft and foreign.
There is a difference between short oblique bangs and long oblique bangs. Long oblique bangs are equivalent to your bangs forming four or six points, then four points are clamped behind your ears, and six points are curved. This kind of bangs can well modify the edges and corners of the square face and have the effect of showing a small face.
You can try the eight-character bangs, which are bangs with fire in Song Hye Kyo. The eight-character bangs can modify the cheekbones on both sides, making the overall temperament soft, and will not bring a heavy feeling because of the heaviness of bangs, but highlight lightness and femininity.