name that anime

i remember these from when i was about six, anime was the only thing i would watch but the phase passed and came back with a vengeance and im trying to put names to the memories of my favorite anime's please help

1. the characters based their armors on zodiac signs. There is lots of 1on1 fighting in fact i think it was a contest

2. post apocalyptic with the main character ken walking around killing this guy and that guy, very bloody

3. don't know much about this one except that one of the characters had a white tiger and all the characters based their armor on animals, very cool and very dark

4. three siblings who can use magic, very funny

5. the main characters were dressed up as birds and fought aliens