Who is the strongest in yu yu hakusho in brute strength?

Answer 1

As far as the four main characters go, Hiei and Kurama both have relatively low strength levels, Hiei relies more on speed and Kurama relies on strategy. This leaves Yusuke and Kuwabara. In hand to hand, Yusuke would almost always beat Kuwabara, especially once he enters his demon form.

However, in the wider world of characters, those who surpass Yusuke in pure strength are the three demon kings. Of them, Raizen probably is the strongest, since Mukuro loses the bulk of her power and Yomi depends more on defensive strategies that tire his opponents.

Therefore, the answer to your question would probably be Raizen.