For me it's like this:
Like: Makoto, Kyoko, Togami, Aoi
Dislike: Toko (I only liked half of her...the genocider half XD), Hagakure (my god is he useless)
Like: Hajime, Sonia, Akane, Little Gangsta
Dislike: Soda (same as Hagakure)
...it's pretty even in terms of surviving cast for me based on quantity. Although for who I liked more?
Hajime>Makoto (JYB ftw)
Kyoko>Akane
Togami>Little Gangsta
Sonia>Aoi
Soda>Hagakure (the two "why didn't they die instead?" survivors. I guess if I had to pick, it would be Soda. Mostly because at the very least, Soda has a relevant talent while Hagakure..nuff said)
Half of Toko>empty slot XD
It's...pretty close again XD.
It's a little weird for me to compare the DR1 cast and DR2 cast. DR1 cast had the two best main side characters with a weaker main protagonist while the DR2 cast had a weaker two (it was more equal for all the side characters) with a stronger main protagonist.
Sonia Waifu is there so I guess I liked DR2 the best. XD