On the last couple 10 Wishes I have pulled, I have obtained Noelle on every single pull, so I have received 5 of Noelle's Stella Fortuna. Once I have Noelle's constellation complete, what do I get the next time the character drops on a wish?
For a duplicate 4 star character on whom you already got c6, you get 5 masterless starglitter. For a duplicate 5 star character on whom you got c6, you get 25 masterless starglitter ... and disappointment.
|wished item||Additional reward|
|Duplicate 5★ Character||10 Masterless Starglitter and 1 Stella Fortuna for that character|
|Duplicate 5★ Character (Constellations Maxed)||25 Masterless Starglitter|
|Duplicate 4★ Character||2 Masterless Starglitter and 1 Stella Fortuna for that character|
|Duplicate 4★ Character (Constellations Maxed)||5 Masterless Starglitter|
|5★ Weapon||10 Masterless Starglitter|
|4★ Weapon||2 Masterless Starglitter|
|3★ Weapon||15 Masterless Stardust|
Source: Genshin Impact Wiki