Current Boo runs the gauntlet

[Captain Cadaver]

Boo from the most recent chapter of the manga runs the gauntlet. The battle takes place on the ToP stage with ToP rules. Manga versions of all characters, obviously. His opponents are all aware of his chocolate beam and any prior knowledge they may have on him, whereas Boo has no intel he wouldn't naturally have.

Gauntlet:

SSR Black
Fused Zamasu
PSSB Goku & ToP Hit
SSJ Kefla
SSJ Kefla & End of ToP Gohan
SSBE Vegeta
Jiren (vs SSBE Vegeta)

 

[SSJ2]

Loses to Vegeta.

 

[Let's Go Fearless!]

Likely to lose against Vegeta.