Tatsu vs Mr. Immortal: who would win?

Too close to call

Tatsu · Sakamoto Days · Base

Tier
9-B
Attack Potency
Wall Level+
Speed
Supersonic+
Durability
Wall Level+

Mr. Immortal · Marvel · Base

Tier
9-B
Attack Potency
Wall Level+
Speed
Supersonic, up to Hypersonic
Durability
Wall Level+

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