My advice is more on the world-building end of creating characters, not so much on the technical side, so be warned.
So...Whenever creating a character, you shouldn't think of a character you would WANT to be in a story, but rather of a character that is there BECAUSE the story is happening. In other words, worlds create characters, then those characters are our view into the events of a story.
Now that character might be super integral to that story, say a main protagonist, so it's fine to follow the shonen tropes to a point.
However, a world should continue to exist with or without them, for the world is a character in itself. One Piece without Luffy is still the world of One Piece. He changes a lot of what goes on in that world, but the world would still go on if he wasn't there, simply because the world is interesting, which creates a lot of interesting characters, which creates interesting character interactions. A story is only a short look into a section of that world, and as a creator, you can guide the when's and the how's and the who's, which can be super fun.
From that perspective, any character that enters a story should fit, not because you force them into the world, but because the world helped shape their individual background and behavior, and by extension, their body type and clothing.
Now when it comes to actual character design, there isn't always a specific right or wrong, but rather whether or not that character belongs in that universe or story. There should be very little conflict between a character's motivations or style, unless the extreme conflict is a story element in the first place, i.e. the fish out of water story.
If you want your characters to work well, from design to motivation and behavior, you should wonder, how would a character in this world look if they lived in it their entire lives? And if their background is different from everyone else, how do they react to situations differently compared to everyone else?
If you have all of this in mind, a lot of what you create starts to go on autopilot. It becomes not just a comic with characters roaming around in a world, it grows into people who live in a world, and you are the historian who gets to tell everyone the best parts of what happens there.
As for your skill to show everyone that world and story? Just keep working at it. Keep learning techniques and tricks to represent your worlds.