I actually didn't like this one much compared to the previous ones.

For someone who is his "fated one", Shizu was pretty low impact. If Rimuru didn't know beforehand that she was his fateful person, this would have felt even more awkward.

The only thing going for her is that she's Japanese, which only really serves to drive one point home: That she was forcefully summoned, has bad memories of this place and doesn't want to rest here.

Veldora feels more like the fated one than Shizu.