Neptune is a character from the game Megadimension Neptunia. This is a mod in league of legends for Kayle.

Neptune The Purple Heart Yasuo – Hyperdimension Neptunia The Goddesses
Neptune Purple Heart Yasuo from Hyperdimension Neptunia has entered League of Legends

Neptune Purple Heart (Ekko) – HDN Human Form
Neptune Purple Heart is now in League of Legends as Ekko!