Kamen Rider Thouser vs Souei (Light Novel): who would win?

Souei (Light Novel) favored — Slight edge (~55%)

Kamen Rider Thouser · Kamen Rider · Kamen Rider Genms -Smart Brain and the 1000% Crisis-

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Average Human, up to Ftl+

Durability

Complex Multiverse Level

Souei (Light Novel) · Tensei Shitara Slime Datta Ken · With Ultimate Skill

Tier

1-C

Attack Potency

Complex Multiverse Level

Speed

Massively Hypersonic

Durability

Complex Multiverse Level

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