Shion/Relationships

Diablo
They both are the most fanatical worshippers of Rimuru, while also both vying for the Secretary position of Rimuru, making them rivals of sorts who actually do seem to get along very well otherwise.

Ranga
They don't have many interactions, however, when they fought Charybdis, they cooperated by having Ranga let Shion ride his back to reach Charybdis up in the air.