Iharu Furuhashi vs Shulker: who would win?

Iharu Furuhashi favored — Slight edge (~55%)

Iharu Furuhashi · Kaiju No. 8 · Base

Tier
8-C, up to 7-A
Attack Potency
Building Level, up to Mountain Level+
Speed
Superhuman, up to High Hypersonic+
Durability
Building Level, up to Mountain Level+

Shulker · Minecraft · Base

Tier
8-C
Attack Potency
Building Level
Speed
Immobile, up to Subsonic
Durability
Building Level, up to City Block Level

A heuristic estimate from normalized VS Battles Wiki stats: tier, attack potency, speed and durability.