I’m sure much of us would agree that she’s pretty inconsistent in anatomy, but I think much of what I really like about Itaru Hinoue’s character designs is how well thought-out the designs are. By that, I mean that the character designs she makes within a game creates synergy to each other and the general visuals of the game.
Just look at Kanon. The colors of the cast, for the most part, are carefully chosen to match the overall atmosphere. There are a lot of blues (Nayuki, Akiko, Makoto’s outfit, male uniform) and oranges (Ayu, Makoto’s hair) in the designs to match the wintry sky made prominent by the snow-white town. There are also browns (Yuuichi, Shiori, Kaori) to match the trees. Mai’s design is especially meant to match the evening scenery she’s often seen at.
The vibrantly red female uniforms is probably there so that the character designs don’t drown out too much with the blues and oranges, I guess. (BTW, I just noticed that all the heroines have some red in their designs, which is interesting.)
As for my favorite, I personally like the overall character designs of Air and Rewrite best.
For AIR, the girls’ designs are united by blue color, (Kano’s hair, Misuzu’s eyes, Minagi’s hair decorations) which is the color of the sea and the sky. Apart from that, there’s a lot of warm colors and blacks that creates a sense of nostalgia and ‘olden times’ (can’t articulate it well), which is basically AIR’s general ambiance in the first place.
I also really like Kano’s character design, especially her casual outfit.
For Rewrite, there are a lot of nature colors in the designs. Besides the eyes, nothing much else is too vibrant – any color beyond shades of browns, oranges and yellows are toned down. Red shades are either pink (Kotori’s casual outfit, THE UNIFORMS) or maroon (Shizuru’s jumper, Kotori’s skirt). Purple shades are lavender (Chihaya’s dress), or dark purple (Chihaya’s skirt, Lucia’s hair). The vibrant red color is saved for the uniform trim and Kagari’s ribbons. There are also a lot of blacks, too, from Kagari to Akane to Lucia to Kotarou as well.
I also noticed that the simplicity of the designs (sure, the uniforms are detailed, but they stick to few colors) is to make it easier to blend with the environment.