Ahh, Yukina. Kuwabara's lovely Ice Maiden from the Floating Island of Ice Koorimes. In the anime, during the Spirit Detective Saga, episodes 22-25, we are introduced to Yukina, Hiei's half-sister.
While watching the mission video Koenma sent Yusuke, Kuwabara instantly fell in love with the female demon and knew that he had to save her from Tarukane's fat clutches at all costs.
After the Toguro brothers were 'defeated', Kuwabara pleads to Yukina that she if she could try to not hate all humans. Smiling, Yukina tells him that she doesn't hate humans at all, and that she's rather fond of him. Later on, they reunite at the Dark Tournament. Yukina is an innocent Ice Maiden who cares about her friends and heals them whenever nessecary.

Ups

We all now that in the anime and manga, Kuwabara and Yukina seem to have a relationship of some kind. Some believe that these two wouldn't make a good couple. Well, why don't weigh the good against the bad?

Downs

Nooo!! Did we have to come to this section?! :( Oh well, we must...
Although there are various hints and facts that these two get along and could make a cute couple...there are obstacles standing in their way.

Overall

Despite their age differances, and their blood, I think this couple would really be able to be together. Both are sweet persons who always care about their friends and the wellfare of others.

Botan

Botan, guide to the Underworld in the manga or Spirit World in the Anime. She reaps souls to the other side when their time comes, but she's not what you might think of when you hear 'grim reaper'. Cheery and outgoing, Botan loves to talk, and can often blab out important secrets she was meant to keep.
When matters are serious though, so is she, and nothing can stand in the way of her job and her boss, Koenma. She loves all her friends and is deadly afraid of Hiei killing her if she blabs out the secret that Yukina is his sister.
She first appears in the series as a normal grim reaper who gives Yusuke the option of coming back to life. She then becomes a sort of sheperd for his soul while he endures the test to return to the realm of the living. After he does ressurect, Botan becomes the Spirit Detective Assistant and gives Yusuke all of his missions and their details. She's also a spirit healer.

Ups

When Kuwabara first meets Botan, he develops a crush on her and asks her to marry him. Even though she denies, the two might be a sweet couple.

Downs

Err...not that many facts or reasons, eh? It really is one of those 'odd couples' a lot of people like writing about. I personally like these two together, but there downs, people.

Overall

I think this realtionship would be better as, the mother loving kind, because Botan does worry about Kuwabara, because he's the weakest on the team, but she doesn't really pay much attention to him. Kuwabara likes Botan, and might find her attractive, but he's devoted entirely to Yukina.