@SpeedForceSpider: Yes it is... lol
Vegito in base form could probably do every level.
stuff link SSJ3 Goku etc and anything below that are just irrelevant and pretty much would have to use all their power to maybe cut 1 of Vegito's hairs.
SSJ3 Goku is weaker than SSJ3 Gotenks, whom is weaker than Mystic Gohan, whom is weaker than Super Buu w/ Gotenks absored, Mystic Gohan is then absorbed.
This final version of Buu is still toyed with by base Vegito.
Round 1: None of these could hurt Vegito
Round 2: Considering many people on this website put Super Janemba between Mystic Buu and Kid Buu, Another round where the characters can't hurt Vegito.
Round 3: Hardest to compare out of the bunch, either way if SSJ is an option this is again one sided.
Round 4: Easy for base Vegito
Round 5: Easy for base Vegito