I think I have a general idea of Ryusuke’s character arc, or just a small bit of it. Ryusuke is thrown into the world of Honkai Impact 3rd, where he just wants to live a normal life. He subconsciously still believes that things haven’t changed, but his mindset changes when he becomes a Herrscher, and is thrown into the Sakura Samsara. He grows fearful of the world and the shadows of the organizations that rule it, but this fear is buried in the back of his mind until it’s brought to the forefront by the arrival of Griseo. This fear begins to consume him and his desire to live a normal life, until… he decides enough is enough. He decides to stop living in fear of the shadows of giants like Schicksal and World Serpent, deciding to take matters into his own hands. He’s done living in fear, he’s going to enjoy his normal life, and nobody is going to stop him. Anyhow, hope you have a good day!
I don't really agree with saying that having a handsome mc means that the girls will fall in love with him after looking at the main character. Honestly that's just up to the person writing the story. In fact most people shown in honkai are beautiful/handsome, including the zombies. I understand what you're trying to do, but the reasoning isn't really there in my opinion. Regardless, you don't have to explain why you chose the mc to look like that, I'm sure people will imagine him differently despite the picture.