Bismuth vs Chihiro Fujisaki: who would win?

Chihiro Fujisaki favored — Slight edge (~55%)

Bismuth · Steven Universe · Base

Tier
HIGH 7-C, up to 6-B
Attack Potency
Large Town Level, up to Country Level
Speed
Relativistic
Durability
Large Town Level

Chihiro Fujisaki · Danganronpa · Alter Ego (Goodbye Despair)

Tier
LOW 7-B
Attack Potency
Small City Level
Speed
Unknown
Durability
Unknown

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