Best: Ging Freecs
I could swearn Ging freeks falls under the worst category? I mean, he just ditched his son... like seriously.
He could have at least trained Gon to be hardcore buff...>__> But I guess the story would be less epic that way cause then the main chara would be too strong.
Jinsuke from Gamaran . he is the main villian after all . a heartless , cruel warrior
Shuji Sumimura from Kekkaishi . (in a funny way) he is a househusband , cleans the house , cooks , washes and looks after the kids alone . there is no father like him in the manga world : )
I'm not sure about Ging...he's the same as Minato...the stuff that would make him worst father are the stuff that actually propelled and educated the sons, and made them what they are...so they incorporate both...
Lelouch's dad is a worst dad candidate that's for sure...egotistical bastard...
But for best...I think Kurosaki Isshin can be counted as best father, but Maes Hughes from FMA just tops them all
Yessss...how could've i forrgotten Maes Hughes
Bunta Fujiwara: He is not your typical dad and the way he trained Takumi as a driver was very unconventional and unique; in fact, every lesson he has taugh Takumi has been like that, but he really cares about his son and he's always there when Takumi needs him.
I dunno if I can consider Oga the best or the worst father, but he certainly is unique, in a funny way.
He threw an ice cube at En, Beel's older brother. After Hilda comically stabs him in the head with her umbrella sword, and En talks to Beel, Beel reaches for the glass, picks up an ice cube, and throws it at En. Three times! xD But, after a while, Oga started caring about baby Beel and does teach him good stuff, like defending himself and friends. He also suggested mechanical pencil as a Christmas gift for Beel. xD
His name is already been mentioned several times in this thread, but to be honest Ikari Gendo is the worst father I've ever seen in Manga/Anime. He manipulates his only child to cause a huge catastrophe, not to mention he rapes him psychologically as well. Sugar coated lies are more dangerous rather than blatant violence in my opinion.
For the best father... I'm going to say Kurosaki Isshin from Bleach. There are still more secrets about him that has yet to be revealed, but I think he's a great father figure. Fun, strong, and care about his family in his own way.
The best might be Minato Uzumaki. He sacrificed himself and his wife in order to protect his son and give him strength and power for the future. The worst would probably be Monkey D. Dragon. The man hasn't even met his son! He left Luffy with Luffy's grandfather Garp who in turn abandoned him with mountain bandits.