Blade of the Immortal introduces them one at a time, and they're plenty unique -- any confusion, like with what's-her-name, the bleach-bonde one when she's wearing a wig, is intentional. My problem is KNOWING THEY'RE GOING TO DIE. Makes it hard to get attached, you see.

(For example, the last character I really liked had a name starting with S and ending with ri. *cries*)