The Mystery Cartoon Character Game, ongoing-ier.

Spot on, OUB - Blabber Mouse it is! You've explained clue 3, clue 1 is self-evident, clue 2 refers to Blabber making the sound of the siren.

Award yourself a big, shiny point, and bring on your next mystery character, if you please!

Perhaps old Fred Quimby was right: cat and mouse as adversaries had been done to death in cartoons. Bill Hanna and Joe Barbera had tickled the idea of "frenemies" in their Tom and Jerry series, so a television series about a cat-and-mouse partnership was the next logical step. Lateral thinking at its finest.

Well, this is a well-traveled road, but somehow this character got missed. I shall remedy that:

1) This character appears in a regularly televised animated series that's no longer in production.

2) Like Lola Bunny or Scrappy Doo, this character is not part of the original lineup, debuting instead in a reboot series.

3) This newest character becomes the Team Pet, although they already have one to begin with. The two pets don't get along.

Little guys are often so adorable. Like this mystery character, Bleep, from "Josie And The Pussycats In Outer Space."

1. That show ceased production after just one season.

2. He was only there for the outer space adventures, natch.

3. He and Sebastian were about as adversarial as Josie and Alexandra.

Absolutely correct, this is Bleep, the weird wooly thing that Josie and the Pussy Cats in Outer Space adopted in their first episode, "Where's Josie?" That's good for a fresh +1, and control of the Board, Emerald Isle.

Oh, and an update:
Arthur has 4 points,
Damfine has 4 points,
Emeraldisle has 326 points,
Eminovitz has 2 points,
FluidGirl has 58 points,
Glowworm has 237 points,
IronCookuru has 121 points,
Mreiof has 12 points,
Oneuglybunny has 131 points,
PatrickRsGhost has 13 points,
Peterhale has 131 points,
Rollo has 11 points,
Saltyboot has 189 points,
Seiry has 2 points.

There were 46 unguessed characters, totaling 1287 Mystery Characters.

Thanks, OUB. Now it's time for another no-brainer:

1. I'm a rodent.

2. Like all the others, my name is also my species.

3. The protagonist foolishly mistakes my warning about the weather for a holiday.

More clues are needed, I see.

4. In an earlier cartoon, I'm ordered not to feed the bear.

5. I keep reminding my friends that I'm not in the book.

6. A running gag has me falling into my hole.

Well, this shoots down my earlier supposition: that this was G. Weatherby Groundhog from the public domain Woody Woodpecker cartoon "Pantry Panic."

Sorry about that, OUB. Cheer up.

Ah ha, this must be Gopher from Winnie the Pooh.

Yes, Saltyboot, it certainly is the Gopher. Now to explain the clues:

1 and 2 are self-explanatory.

3. When he warns Pooh about Windsday, Pooh, thinking it's a holiday, goes about saying "Happy Windsday!"

4. In "Winnie The Pooh And The Honey Tree," Rabbit orders him not to feed Pooh any more honey, as the bear is stuck in Rabbit's front entrance.

5. He was created by Disney, and was never in any of the original stories.

6. Self-explanatory again.

So you're up again, Salty. Good job.

Great! Here's one that I whipped up.

This is another character who's name is also his species.
I'm very sophisticated.
I believe that my friend should pay for his crime.

OK then, here's round two.

One of my friends is timid, and the other is reckless.
We literally risked our lives to clear our reckless friend's name.
In the original book, I am not stuffy. Instead, I am very laidback.

Aha! That's clinched it! Mole is timid, Toad is reckless, so this is Ratty - Water Rat - from the Wind in the Willows segment of Disney's The Adventures of Ichabod and Mr. Toad.

Yes, that's it!

Ratty, Mole, and Badger all risked their necks trying to clear Toad from auto theft charges.
Before they found out about Toads' innocents, Ratty believed that Toad should pay for the crime.

OK, peterhale. You're up!

Thanks!

1) I like to give orders, but my wife is the boss.
2) I plead for a trial.
3) I tend to get overlooked.

Ah, this can only be one guy: The King Of Hearts, from "Alice In Wonderland."

It is indeed!

Bouncy and enthusiastic, he adds "By order of the King!" when reitterating the Queen's instructions. He asks that Alice be tried before her execution - perhaps more because he wants to preside over a trial than any concern for Alice. Very short, usually hidden by the Queen's gown, and treated dismissively by the White Rabbit.

All yours, Em!

Thanks, Pete. And now, just in time for Labor Day weekend, I present these clues:

1. I'm the boss man of a bygone era.

2. My looks constantly changed before I ultimately became a tall guy with glasses.

3. My name may make you think of blackboards.

The only name that comes to mind is Mr. Slate.

And it is indeed he.

1. He's Fred'd boss.

2. In the beginning, he was an un-named little man with white hair. Then he became more like the prehistoric ancestor of Mr. Spacely. Finally, he was about Fred's height, and wore glasses. It should also be noted that he was at various times also known as Mr. Rockhead(no relation to Joe), and Mr. Granite.

3. Slate is used for blackboards.

So you're up again, Salty. Good job.