>>49536166Fire/Dark or Fire/Ground fits the best.
The minotaur is noted for cruelty. They wouldn't play that up for your starter though(see Incineroar being a softie despite being a dark type).
As for ground:
>A scientific interpretation also exists. Citing early descriptions of the minotaur by Callimachus as being entirely focused on the "cruel bellowing" it made from its underground labyrinth and the extensive tectonic activity in the region, science journalist Matt Kaplan has theorised that the myth may well stem from geology.>He points out that carbon dating of marine fossils attached to boulders that were ejected from the ocean by ancient tsunamis indicates the region was tectonically very active during the years when the minotaur myth first appeared.>Given this, he argues that the Minoans used the monster to help explain the terrifying earthquakes that were "bellowing" beneath their feet.Of course, if they focus on the "bellowing" itself, they could make it a Fire/Normal type with Round, Hyper Voice and maybe even Boomburst.