A few more.

Not totally Saturday morning are
Dragonball Z
Dragonball GT
Naruto
Naruto Shippuden
These are good series but not as much on the mature scale.

For more mature try
Bleach
Outlaw Star
Cowboy Bebop
Neon Genesis: Evangelion (This one gets a little strange)
Grave of the Fireflies
Witch Hunter Robin
Akira
Tenchi
Ah My Goddess
Escaflowne
Perfect Blue

__________________
"...I won't be your winter...and I won't be anyones excuse to cry."

"Even heroes have the right to bleed."

"I'm wakin up at the start of the end of the world