I voted Other, since you missed one.
Dark Bowser 
(On the right)
Spoiler Below
INFO: This version of Bowser appeared in Mario & Luigi: Bowser's Inside Story as a mixture of the Dark Star and Bowser's genes. Not to mention Fawful. This version, while not actually the real Bowser, deserves a place on the poll because he does possess Bowser's genes, as well as his own immense power. Plus he looks cool.
PRO:
-Has all of Bowser's abilities, but even more powerful
-Has unique powers far greater than Bowser's own, like creating minions
-Can grow twice as large to become even more powerful
-Continually heals self if defeated
CON:
-Without the Dark Star Core, is utterly powerless
-Some powers may be Fawful's doing, which would not have happened if Fawful did not absorb Dark Star's power
-Susceptible to damage