Questions about Guardians of Middle Earth DLC's

Hi all! ^^

My question is:

• Each DLC contains a New Skins+Some Gold (Like League of Legends skins...) for the Characters OR Each DLC contains NEW Characters+Some Gold?

• If I dont wanna pay for the DLC's I cant play with the characters or there is a Weekly Rotation? (Like in League of Legends...)

Thanks for the answers! ^^