That Buddha monster just wouldn't give up, it had some pretty destructive attacks too. Kei was the only survior from that battle.
I thought the shorty aliens where tough little buggers. Super fast, incredibly strong, and the way Kei could hear them speaking through his mind, creepy. When the mission was over Kei thought he was safe, but when that alien showed up at his school you couldn't tell what he was thinking. That shorty alien fought to the end.
Kudou, the guy who had his brain eaten by that buddah, went crazy. He said, "This monster has taken my voice and memories... Now I have become the monster". He couldn't get enough of hearing him say, "I feel so powerful".
Raising my fighting spirit.