Honkai: Star Rail’s Trailblazer isn’t just a throwaway character. Like the Traveler in Genshin Impact, the Trailblazer can counter multiple weaknesses because of their ability to control more than one element. Each element also empowers them to play completely different roles depending on the team. Unfortunately, the Trailblazer also has a unique way of unlocking Eidolons compared to other characters.
Eidolons are copies of characters that unlock additional abilities for each one you get. You get Eidolons for most Star Rail characters from pulling on banners. For example, if you already have Dan Heng but happen to pull him again from a banner, then that copy will give you an item that unlocks his first Eidolon (E1). You can unlock up to six Eidolons per character before Star Rail converts the additional characters into other currency to spend in its in-game shop.