DC Animated Universe!- Got lazy, omitted a LOT of 'The' from the list.
For those that don't know, the DCAU is Batman: The Animated Series, Superman: The Animated Series, Justice League, Justice League Unlimited, and Batman Beyond, in internal chronological order. Cast is broken up by heroes, then villains, for each series.
Due to cast size, I can't guarantee there won't be double casting involved.
Batman
Robin- Tide. Went on to bigger and better things, but definitely had some kid sidekick vibes starting out.
Batgirl
Commissioner Gordon- Pyro. Upstanding and prefers to go by the book, but knows when to step aside and let the crazies handle it.
Alfred- Dhyer. Just kinda does his thing while quietly snarking from the sidelines.
Catwoman- Idun. I dunno, I can almost imagine her in the almost-but-not-quite-terrorist animal rights activist role Selina sometimes took.
Joker- Meeple. Prime lord of chaos, the evil clown of destiny.
Harley Quinn- Ciato. Perky Meeple fangirl.
Penguin- Zenny. Memorably played by Danny Devito in another continuity.
Riddler
Mr. Freeze
Superman- Andrew. His only regret is that he can't save everyone.
Lois Lane- LD. By god, she is going to get to the bottom of this, no matter HOW wreckless she has to be to do it! Yeah I got nothin'.
Lex Luthor- Grefter. Sorry I am late, I had to go put on my power suit.
Darkseid-
Brainiac- Hatbot. Absorb all data. Destroy all life. Program complete.
J'onn J'onzz- Laggy. Absurdly powerful, so the writers have him regularly fry himself on humanity's fail to keep him in check.
Flash- VSM. Could be the strongest in the League, if he weren't held back by his own irreverence and insecurities.
Hawkgirl-
Wonder Woman- Elfboy. Strongest woman in the world.
John Stewart
Green Arrow- Shale. He could pretty much be Ollie's VA in the series.
Black Canary- Tal. Let's Sing~
Huntress- Rob. Shoot first, ask questions if you miss.
Question- CK. Not cool enough for the role, but has the same tendencies to see connections everywhere.
Booster Gold- Sopko. By request~
Amanda Waller- Super. I'm not sure if I can explain it very well, but just 100% pure Super.
Gorilla Grodd
Terry McGinnis
Old Bruce- Snow. Crotchety and believes tough love is the only love.
Blight
Preliminary list, will start casting/adding on over the next hour or so.