It wouldn’t be a HoYoverse game without a colourful cast of characters to pull. In Zenless Zone Zero, these playable characters are called Agents and we can expect to see 15 of them at launch.
You can only get Ellen from the Exclusive Channel (pictured above). As this is a Gacha system, it’s all luck-based. There’s a pity system in ZZZ, and you’re guaranteed an S-Rank unit after 90 Searches ...