Since... Astolfo was never accepted and the person playing him vanished... 

[list][*][b][u]Name:[/u][/b] Asterios, also known as the Minotaur though better not called by that title.
[*][b][u]Gender:[/u][/b] Male
[*][b][u]Appearance:[/u][/b] [url=https://grandorder.wiki/images/9/95/Portrait_Servant_053_3.png]Big and muscular.[/url] Particularly the 'big' part; Asterios stands at 298cm tall, or 9'9. Presumably not including the horns.
[*][b][u]Personality:[/u][/b] Though ordained a monster from birth and known to eat people, in truth Asterios is not a wicked person and will fight against his past even if it would destroy him. To those that would use his name, he's quite amenable to even someone quite demanding. Strange as it might seem, this monster with all his limited speech is by far one of the most gentle Berserkers and easily controlled.
Simply don't call him the Minotaur. 
[*][b][u]Brief History:[/u][/b] He's the Minotaur. Born to the wife of King Minos and a bull, he was summarily stuck in a maze of Daedalus' design and fed humans as sacrifices. So far as life stories go, his winds up being rather short--after Theseus arrived and had a conversation with him, Asterios was slain and it ended there. Now summoned into Chaldea, he has a far more enjoyable situation than his real life, having far more ability to experience the outside. 
[*][b][u]Universe of Origin:[/u][/b] Nasuverse
[*][b][u]Equipment:[/u][/b] As a weapon, Asterios originally had an enormous Labrys... [url=https://i.imgur.com/BuaavtY.png]which he split into two equally-massive halberds[/url]. The style of axe quite possibly gave its name to the labyrinth, yet as weapons they do very little--except be remarkably strong and durable to not shatter when swung around.	 
[*][b][u]Abilities:[/u][/b] Asterios is a monster by nature and has the raw strength to show for it. His baseline level of strength is enough to overpower a raging Heracles and his durability enough to survive a blow that would kill the same. Further, his abilities as a Servant allow him to improve all his attributes further whilst raging, and exceed his strength on top of [i]that[/i]--fittingly, trying to approach the minotaur in a contest of strength is a dismal failure. His speed and agility, though superhuman, are nowhere near as extreme--making it even easier to exploit his glaring weakness. Quite simply, for all his raw strength and toughness, Asterios hasn't any skill in fighting or tactics. He's an excellent navigator, however.
As a Servant, his Noble Phantasm is predictably the Labyrinth itself--something that can be manifested by recalling where he used to live. Predictably, it is a powerful magical construct, inescapable until Asterios himself is slain--though if you knew in advance to bring string to find your way out and started at the entrance, finding your way out would be more likely. He can also dissolve it, whether because it's done or simply because it's time to leave, and navigate the labyrinth fine... even though it takes a different form each time.
[*][b][u]Other:[/u][/b] [url=https://i.imgur.com/d9AblIw.png]Sprite for halberd scale.[/url][/list]