1. If you get the pack from the RPGMaker folks (on Steam or RPG Maker Web), then that pack includes the characters and tiles. On itch.io (and other sites with the general license), the character and tiles packs are separate. So if you have the base Time Fantasy pack via an RPG Maker source, then you would already have the content from this pack and the base tileset pack.
2. The Mythical Monsters and Lich Crusades packs are exclusive for patreon. All unique content!
I hope that answers your questions.