Sunday is a 5-star Imaginary Support (Harmony) in Honkai: Star Rail. Sunday is a 5-star Imaginary Harmony character who plays pure support, building combat advantages through skill point management and targeted buffs for allied damage dealers. Most supports pick one lane — sustain, buff, or SP generation. Sunday runs multiple at once, which makes him a premium flex support in teams that need both SP and offensive steroids. His value scales directly with whoever he's enabling.
| Last Review | Last Build Update | Last Teams Update | Last Profile Update |
|---|---|---|---|
| 1.0 | 1.0 | 1.0 | 2026-04-13 |
Sunday is a 5-star Imaginary Harmony character who plays pure support, building combat advantages through skill point management and targeted buffs for allied damage dealers. Most supports pick one lane — sustain, buff, or SP generation. Sunday runs multiple at once, which makes him a premium flex support in teams that need both SP and offensive steroids. His value scales directly with whoever he's enabling.