Also this. Cell was a great character, and he is the only major villain that was just ignored after his death.
Vegeta's a Z-fighter now and consistently made the second strongest character.
Freeza was resurrected and is getting an entire new arc in Super in addition to his movie.
Buu not only split into a good form, but his evil part was reincarnated, and EoZ showed Goku passing the torch to him(we'll see how that ends in Super, that damn torch never stays passed).
Cell needs some love. Hell, I'd even take the current time-line's Cell that was allegedly destroyed in Gero's lab. Imagine if the supercomputer continued gathering DNA throughout the rest of the series and part of Super.
Cell with the cells of Boo, Beerus and Whis and maybe even Dabra? What a fucking monster he'd be. This needs to happen.
Speaking of villains and Cell: In terms of likeability, and setting the villains from the 13 DBZ Movies aside, as they're non-canon, Cell has always had a particular appeal to me, especially in Perfect form. From the 3 major villains presented in the 3 main arcs throughout DBZ (if we included the real evil, maniacal, genocidal, psychotic villains from DB, we'd have only Piccolo Daimao and Piccolo himself), Cell is indeed the only one who hasn't been given any time after he was killed. We can understand the reason to bring Freeza back, he's so charismatic a villain that he's constantly referenced throughout the later arcs in DBZ and had a large number of cameos in Movies and even the Majin Buu arc in DBZ, along with an entire movie entirely dedicated to his revival (Fukkatsu no F), and as for Majin Buu, we have his fat version among the team AFTER Kid Buu was killed off, so he's still there. Cell, who works as the link between Freeza and Majin Buu at all levels, is really the only one who had his full time during the Cell arc and was subsequently "forgotten".
As far as the MAJOR villains go, my LEAST favorite one is Majin Buu, especially in his fat form. He's just too likeable a character to be taken seriously, which is the entire reason why they changed his design later on during the saga. If you include DB, Piccolo Daimao is right there at the top (I think my kanji in my avatar says it all, and I even have it tattooed on my chest). If you include the ones who weren't the main villains throughout a particular arc, you'd have to include the likes of Zarbon, Dodoria, the Ginyu Tokusentai, #19, Dr. Gero, #17, #18, Dabura, just to name the most prominent ones, and even Vegeta, who was initially introduced as basically a smaller version of Freeza (proud, evil, ruthless, a killing machine and apparently unbeatable).
The way I view it, the arcs should be divided this way, along with the respective main villain(s):
Piccolo Daimao arc - Piccolo Daimao
23rd Tenkaichi Budokai arc - Piccolo
Saiya-jin arc - Vegeta
Freeza arc - Freeza
Jinzouningen arc - #17 and #18
Cell arc - Cell
Majin Buu arc - Majin/Kid Buu
There are two additional main villains, who can be found in the Trunks Special: Future #17 and Future #18
The perfect villain is Freeza, since you can end up really hating him (he's evil, ruthless, proud, egotistical, maniacal, genocidal, uncaring, racist and sadistic). Not a single trace of goodness or respect towards life other than his own inside of him. Hence his place as arguably the most charismatic villain in all of Dragonball. In a way, that makes him my favorite villain, but there are other factors on which to judge that position, and Cell just has some sort of appeal in terms of the class + power combo that should make him extremely attractive, although he's just as egotistical, evil and ruthless as the others (in his first form, he absorbs millions of humans in a horrific way through his tail, and in his second form he murders thousands of people by destroying islands in an uncaring manner in search for #18). Kid Buu can't even really be deemed "evil", he just destroys everything and everyone in sight out of sheer pleasure, he probably doesn't even understand the concept of "right" or "wrong", he's just a force of nature whose only purpose is to destroy.
I highly doubt there's 1% of probability of it ever happening in the near future, in DBSuper or anywhere else, but I would more than welcome the concept of having Cell back at least for a few episodes.
If you include the Movies, then obviously Brolly has to be considered the most charismatic villain, since he's just a force of nature, supposed to be next-to-invincible and absolutely psychotic. I also like the concept of Turles, Cooler (to some degree) and Janenba, and I regard their respective movies (Movie 3, Movie 5 and Movie 12), along with Movie 8, as my favorite/the best ones, despite their non-canonness and their depiction of "what-if" scenarios based on the exploring of potentially interesting concepts/villains/events with a rushed plot.
I have some sort of fascination with demons/hell/the devil, so I've always had a special place for Dabura as well.
Not including Beerus in this, as he can't really be deemed "evil". Nor "good", either". He's neutral, no one's ally, he's been tasked with a "mission" and merely sees to it that it's done, with a few whims over trivial matters that cause him to destroy a little bit more than he was supposed to. However, he's laid-back, displays many comic characteristics and behaviors and is even gentle/polite, especially in BoG. Additionally, he's such a strange entity that he probably lacks the same understanding of "right" or "wrong" as normal, emotional beings have. It's not that he doesn't understand that, it's that he's BEYOND that. Whis doesn't seem to disapprove of any of his apparently "evil" actions, which further strengthens the theory. The concept of his personality/being is totally new in Dragonball prior to his introduction, which is part of his success among the fans, including myself.
If I had to make an absolute list of my all-time favorite characters, I'd have to go with:
1 - Vegeta
2 - Piccolo
3 - Tenshinhan
(Interestingly enough, all of them share a background of having been evil in the past and having turned good, although the pace at which they do it differs radically from each other; in Tenshinhan's case, all it takes is a few advices from Muten Roshi and one arc, in Piccolo's case, despite never discarding his seriousness and anti-social behavior, he goes from being a maniacal demon to a full-fledged good guy having all but lost all traces of evil in his heart in two or three arcs (by the Jinzouningen arc his transition is complete), while in Vegeta's case the progression is much more gradual and incremental, he was first introduced as a full-fledged villain, he displays some respect towards the Earthlings by refraining from killing them on Namek and making an alliance with them, he joins the gang in the Jinzouningen arc and has a son with Bulma - "the bad guy among the good guys" - and has his final instance of really evil wrongdoing in the early Majin Buu arc, letting himself become possessed by Babidi and killing hundreds or thousands of people at the stadium; after that, his transition is also complete and all that remains is his obsession to surpass Kakarotto and all fighters, to become number one in the Universe, his pride and his natural anti-social behavior and difficulty to adapt to times of peace, apart from his deep-down love for his family and life in general.
4 - Piccolo Daimao (could be higher up, it's a tough call)
5 - Cell
6 - Goku (yes, he's this low in my list and despite instances in which I found myself enthusiastically cheering for him as the sole ray of hope for defeating a particular villain - especially Freeza, given the circumstances -, I found myself smiling at the times in which he took a major beating at the hands of Piccolo Daimao and Beerus). I do admire him and his willingness, as a pure Saiya-jin, to keep overcoming his obstacles, adversaries and his own limits, which he does on a virtually infinite number of occasions, only to be found outclassed again and having to surpass himself yet once more, starting the entire process all over again, just like Vegeta, who despite having surpassed a number of warriors who had been previously stronger than him (Zarbon, Dodoria, Recoome, Ginyu, Freeza, #18, Cell) also had his own fair share of major ass-kickings (Zarbon, Recoome, Freeza, #18, Cell) after proclaiming himself - again - the strongest fighter in the entire Universe.
7 - Dabura
8 - Turles (if you include the movies)
Never been a fan of Gohan, except when he lost it, went Super Saiya-jin 2 and thrashed the Cell Juniors and Cell himself. Before that, he's a crybaby, and after that, he's a nerd more focused on studying and being overly-polite and well-spoken and well-mannered than tapping onto his immeasurable potential as a warrior.