If you liked the Bagi, the Monster of Mighty Nature anime, the Anime-Planet community thinks you'd like:
Ikurou is a young man with problems: after a terrible car accident, he was captured by a seedy organization and implanted with a parasite known as Baoh -- a creature which bestows superhuman powers on its host, especially when mortally wounded. While being transported by train, he is accidentally set free by Sumire, young a psychic girl, and the two make their escape. With more of his humanity slipping away by the minute, and the organization hot on their tracks, will the two escape with their lives, or simply cause a bloodbath along the way?
Although Bagi is much more emotional and Baoh is rather action-packed, both movies have the same premise: a monster is being chased because he is considered to be a danger to people, but once you get to know them better you see that they might be more human than their hunters.
Both anime are based on characters created by Tezuka. In both anime, scientists interfere with nature in some way whether it is creating an enviroment (in JEL2009), creating mutants (in Bagi), or cloning (in both). Bagi is a bit darker (though JEL2009 has it's share of dark moments too). Still, if you like one then you might like the other.