The twins. They serve rarely any purpose other than being our character's voice. Also they aren't exactly nice to look at visually.

Hydaelyn, she destroyed everything so the lesser forms of life can live over a superior race. Also we could have warned them since they knew that they had forgotten something important yet she said no meaning she wanted it to happen. Hermes belongs to this spot too.

Minfilia doesn't need any explanation.

Graha is okay but why is he with us other than for fanservice?