Like the original MHX, a very Sith-y Alter is designed by BUNBUN and voiced by Ayako Kawasumi
Joke manga Fate/GUDAGUDA Order introduced the concept of Saberface (or Seibākao), for characters who look exactly like (Saber of Red and Red Saber) or similar to (Joan) Artoria. There's now almost 20 of these. So, Back Alley Satsuki - Chapter Heroine Sanctuary. introduced Mysterious Heroine X to whittle down the figure... As she explains "The Artoria Species is like a cancer of the universe. Someone must reap them out. Someone must.”
An Assassin version of MHX makes her appearance in last January's Fate/Grand Order Star Wars inspired event. Now, she's gone Beast Mode for this year's Valentines event.
Valentine 2017 Summoning Campaign/Re-Run : Chocolate Lady's Ruckus ~ Valentine ~ Extended Ver. introduces the limited 5★Berserker Mysterious Heroine X (Alter). Like the original MHX, Alter is designed by BUNBUN.
According to Sword Art Online illustrator abec, BUNBUN and abec are neighbors, and aren't the same person despite what style similarities suggest. According to Kadokawa's Taiwan branch, they are the same person. BUNBUN also has a history of subbing for abec at events, possibly owing to the fact abec is (or has said they are) a girl who was in high school when SAO debuted.
She's voiced by Ayako Kawasumi
Craft Essences include
Sweet Crystal, featuring Atilla
Fondant au Chocolat, featuring Arjuna
Choco Angel, featuring Illyasviel von Einzbern.
Cute Orangette, featuring Sakura Matou
Blessful Time, illustrated by Melon22, featuring Fujimura Taiga, Emiya Shirou and Artoria (Casual ver.)
Chocolatier, featuring Emiya Shiro
Bitter Black, featuring Emiya Kiritsugu
Victor's Complacency, featuring Matou Shinji
Street Choco-Maid - illustrated by ReDrop
Kitchen ☆ Patissiere
Tears of Valentine Dojo - illustrated by Tsurusaki Yuu
And returning from last year
Melty Sweetheart - illustrated by Haimura Kiyotaka, featuring Haimura Kiyotaka
In addition, the Coin Chocolates can also be traded to receive "Return Chocolates" from Servants! pic.twitter.com/D0RzGtammQ— Fate/GO English (@fgo_english) February 7, 2017