Your opinion is extremely important

“Your opinion is extremely important”. Your naive belief that it is important atleast to someone here does not cease to amaze me, skip. Admit how many “extremely important opinion” you received after publication?)

Fine, just because of what you did for me, here's a free short code review for you.

General impression: if this is your first independent work, then it is pretty good. The design is quite simple, but everything is well structured. Adaptation at a good level, nothing is moving around and does not cut the eyes. However, there are a number of comments.

HTML:
1) 1100+ lines of code. This is tough. In principle, there is only one complaint – for each pop-up window (characters and blogs) you use a new modal window. This is wrong, it increases the amount of code too much. At a minimum, you should use the handlebars web template system, or better use the Angular / React / Vue framework right away.
2) google fonts. CDN can sometimes fail, I would place the fonts locally, there is the service with web fonts, try it.
3) jQuery. Pulling an entire library for a few features is a dubious decision. At a minimum, I would also place jQuery locally. And better, I would make all the same features on the base js and css.
4) ids. I would not recommend using ids at all. But since you use them in jQuery, this can be forgiven.
5) monotony. Too many divs. Use more p, span and other tags.
6) sections and divs. You alternate sections and divs. I suppose you did it by logical that there should be h1/2/3/4/5 in section, otherwise the validator will swear. However, you can make a section, add h1/2/3/4/5 and then to hide it.

CSS:
1) px and rem. Strange shit, somewhere you use px, and somewhere rem, strive for one thing.
2) hard code. If you will add text somewhere, then the blocks can go somewhere far away, this must be checked in advance. For example, limit the maximum height and add overflow: hidden for a remainder.
3) object-fit. You made object-fit for the pictures on the blog, and that’s great. But why didn’t you do the same for the list of characters and for the slider in modal windows? This is the only problem with adaptation. Pictures in the list of characters and in the slider look, let's say, not very. Use object-fit for them too.
4) hard code again. Some places where you could use the same styles, you use different styles. You should not solve one problem in two different ways. Strive for one thing.

jQuery:
1) in principle, there are no problems because you have only a few features implemented. I found only one bug. When you click a navigation's link for the first time and the smooth scroll drops the page down, your fixed menu closes part of the block. When you click on the link again, the scroll works correctly. This is due to the fact that your menu is assigned a class for fixing and the scroll does not take into account the height of this block. I could have figured out how to fix it, but I won’t, think for yourself.)

As a result: there are actually not very many mistakes, but it seems to me that this is mainly because of not the most complex template. You used html + scss + jquery + webpack or something like that, right? If you want to continue to do such projects, then be sure to use a web template system, this will significantly reduce the amount of code. Better use a framework.

P.S. Yang Xiao Long. You made Yang Xiao Long as the character... I will unlock you in discord, I have a few questions and suggestions, I will write soon.)