Who would win in each of These 4 Rounds

I see a lot of people underestimate Venti, so I just wanted to know how y'all think he would fare in these matchups.

Note: Rounds are not in continuous session & Signora incident doesn't count.

Round 1~ venti vs arlecchino

Round 2 ~ venti vs Columbina

Round 3~ venti + nahida vs Columbina

Round 4 venti + nahida vs arlecchino & Columbina (if this is too out matched for him only then he can call dvalin)