Joan Alter Today

A younger, comical "Santa" version exists, known as Santa Alter Lily.

She is best used in teams that can provide critical stars to maximize her high critical damage potential. Jeanne d'Arc Alter | TYPE-MOON Wiki | Fandom

A party-wide damage boost that doubles for [Dragon] trait allies (level last). Joan Alter

Grants a 50% Buster buff for 1 turn (level second).

She is a heavily featured character in fan art, merchandise, and cosplays. A younger, comical "Santa" version exists, known as

Boosts critical damage (+50%) and star gathering rate for 3 turns (ideal to level first).

Here is a helpful summary of her character and usage in FGO: Grants a 50% Buster buff for 1 turn (level second)

Based on the search results, "Joan Alter" (often referred to as or Jalter ) is a popular character from the Fate/Grand Order (FGO) mobile game and anime franchise. She is a distorted, "Altered" version of the historical Joan of Arc, appearing as an Avenger-class servant designed to be a vengeful figure.