Some of my favorites:
Kanade
I’m really a sucker for just about every aspect of Kanade’s character design. I love long straight hair, silver hair, golden eyes, this style of winter school uniforms, and am quite fond of Kuuderes. I honestly don’t have much of an excuse or anything really critical or well thought out to put here, I just really like Kanade’s character design.
Kyousuke
Because apparently Kyousuke is everyone’s favorite character. God damn if Kyousuke isn’t just the coolest Key character. He’s likable from the beginning of Little Busters! because he is designed to be the charismatic center of the group who thinks of fun, outlandish things to do. And then you get to see throughout refrain that Kyousuke isn’t quite as flawless as he was made out to be in the rest of the VN. His plan to strengthen Rin failed spectacularly, and his actions emotionally abused Kengo and Masato. If anything, Kyousuke is an antagonist for most of Refrain. This imperfection really deepens his character and then you get his farewell to Riki and the floodgates open.
Akio
How Akio acts for the entire second half of Nagisa’s route is amazing. It clashes with how we’ve seen him up until then, which has been mostly playful and sarcastic, but it still feels natural. In Akio’s route (AS and Nagisa spoilers) we really get to see that helping people is as natural to him as breathing, but he’s still capable of acting selfishly. When Nagisa was young him following his dream almost cost her life. Even during the play, the reason he wanted Nagisa to succeed was because he decided that her happiness was far more important to him than his own dream. He wanted her to succeed in part because any father would want to see their daughter accomplish their dreams, but also as… atonement I guess? Like after what he did to Nagisa she deserves happiness.