Yuuzou Takada has an Original Creator credit on Blue Seed.
original creator
TV anime / 1994
OVA / 1991
OVA / 1992
original character design
supervisor
OVA / 1995
TV anime / 1998
OVA / 1998
OVA / 1996
OVA / 1990
Special / 1999
Special / 1995