Lucia Rea Regulus

Lucia Rea Regulus (also known as Lu or Lucia Leah Regulus) is one of the main female characters in In Another World With My Smartphone (Isekai wa Smartphone to Tomo ni).

She is the third princess of the Regulus Empire. Touya Mochizuki meets her during a major coup attempt in her empire, where he saves her and helps resolve the crisis. This leads to her falling in love with him and eventually becoming one of his fiancées/wives. She relocates to live with Touya in the Duchy of Brunhild.

She appears as a young teenage girl (around the same age as Yumina), with green eyes and distinctive silver (or sometimes described as mint green) hair styled neck-length with a silver tiara and long sidelocks.

Personality-wise, she's competitive, hates losing, and is skilled with twin swords as her weapons. She's also diligent, good at cooking with a sensitive palate, and gets along well with characters like Yumina.