Dullest can be in terms of design, relevance to the series & overall character
For me, its Supreme Kai, Fat Buu & Rildo Shogun
1. Supreme Kai was built to be an unstoppable badass God. Piccolo freaked with "dimension" stuff, his agenda of secretly manipulating everyone into luring Babidi & Dabura was cool
Looked like drawing-block character by Ultimate Gohan time. Guess it was da reason for AT fusing him into much "useable" Kibito-Kai
2. Fat Buu was dull beyond words post-Majin Vegeta's sacrifice. His one-note character was magnified even further after Babidi bit the dust. Buildin house, sleeping, pooping, & proceeding to kill (which he has been doin since ages) was bland af
3. Rildo showed promises to be an intimidating foe with his actions. Obeyin Dr.Myuu & commanding Sigma boys while he lays low was kinda...both mysterious & cool
But all that was tossed outta window post his iconic fight against Base Goku. He was serious with SSJ Kid Goku, loses badly. Transforms into liquified-metal form. Trolls SSJ Goku. Again, does nothing as character & ultimately dies a pathetic death (when Baby infects/invades him)
If you observe carefully, the pattern of "dullest" comes as a result of the said characters not living-up to their hype or author/creator failed utilizin them to their maximum capacity
I guess this comes as a natural thing, as Dragon World is generally filled with fun characters. 1 or 2 just stand-out, which are not neccesarrily a "bad" thing, just gives-off an unsatisfied feel of "what-if"
Thoughts?







