Artoria Alter has a festival-themed form known as Santa Alter under the Rider-class as an Event Servant, the self-described "Evil Santa Claus that cleaves through the breath-freezing winter." A form taken by Artoria Alter, who resolved herself to wiping out her own image and attempted to carry out activities as the ally of children/Santa Claus. The sack she holds in her hand is packed with the best selection of presents that she spent a whole year saving up. Because she has completely turned into Santa Claus, Artoria Alter's personality has changed in various ways. The state of Santa Alter's personality is that of Saber Alter's, but there is some degree of difficulty in being bestowed the post of Santa, and with that role in mind, her personality changed to being frank. As Santa, her dreams and ideals of scattering smiles and being merry has resulted in removing the permafrost-like ice of her heart.