but no characters liked raditz, not even vegeta or napa who were kind of team mates and especially not his brother

Doesn't matter. None of them got along with Vegeta during his 1st appearance and what about Piccolo? He was the villain for all of Dragonball.

How can he be your favourite character? He was both weak and stupid.

Because being 3 times stronger than the hero during your appearance is weak.

Maybe weak in comparison to the characters later but at his time he was a whole lot stronger.

And last I checked power has nothing to do with character. Maybe you choose based on strength alone but I base characters on their character.

Also, him being stupid is an opinion.

he was the weakest out of his group , even if i admit that he's not weak only outclassed by vegeta , Nappa , and frieza's gang . Raditz states he is a first class warrior. No characters refuted this. Also I don't remember Vegeta or Nappa ever clarifying Raditz was low class. They called him weak, but that's only because they were rediculously strong for saiyans.

However he didnt have a personality worth praising or remembering , nor did he exhibit being particularly clever . IF anything Raditz can was a coward when facing death, as he kept struggling and begging with panic in his usually arrogant attitude when facing Piccolo's attack .

He didnt also display the usual lack of fear of the "true sayans" of the show .

Sure Vegeta was a jerk but a classy one for the most part , and tag teams of Goku piccolo took Raditz out .... while Vegeta pretty much won despite everything thrown at him , only to be left at the mercy of krillin after the fight

I wont call your choice stupid , but i dont see his appeal . He was just a stepping stone for the others and a mean to discover Gohan had some huge power