Like a typical HoYoverse game, Honkai: Star Rail characters come in a rarity system, where the normal units are 4-star characters and the premium ones are labeled 5-star. Obviously, 5-star characters are typically better, since you need to invest more of the game’s premium currency to get it, but that doesn’t mean that 4-star units should be ignored. For example, one of the best Harmony characters in Honkai: Star Rail is Tingyun, who’s a 4-star Lightning character.