Hikaru and Kaoru Hitachiin are better together than apart

I accept your fun debate! I am an anime fan as well and have watched Ouran High School Host Club a couple times over.

Replies to Questions:

"And, how are they supposed to do their brotherly love act if there's only one?"

In the Host Club Hikaru and Kaoru play the part of a the "forbidden love" characters with their apparent sexual attraction toward each other. They have shown the ability to portray heartbreaking acts shown in various scenes in the show such as episode 4 with the basketball game scene. I believe even if they were separate they would still be able to fulfill their role acting as heartbroken brothers forcefully separated from each other. That would still get their clients to swoon.

"They have never had a fight (except that one episode, but it was fake!!!) and do you think they ever will?"

I deem it possible. They have had issues with each other, but not enough so that they ever had a legitimate fight. I think it is possible and will happen eventually. I have never read the manga so if they did have a fight after the events shown in the television show I do not know about it.

"They don't want to leave each other, and they never will, if you think having only Hikaru and no Kaoru (or vice versa), do you know how they would act without each other?"

As stated before, I think they would still be able to fulfill their role in the club at least to an extent. They have proven that they can be apart and still have self-fulfillment as they both shown in episode 16 when Koaru deliberately sent Hikaru away on a date with Haruhi. Hikaru has shown in that episode and occasionally from that point forward that he could be happy with someone else.

Concluding Argument:

While having Hikaru and Koaru separated does seem unorthodox I believe it would work. If I were with only one brother (and if I were homosexual if a romantic relationship is implied) I think they would still be happy assuming the other twin in also being emotionally occupied with an alternate relationship. It is proven in episode 16 that Hikaru has romantic feelings toward Haruhi and seems to be able to be happy with her without Koaru present. Therefore, it is possible for them to be separate and happy as well as fulfill their role in the club.

Sources:
- http://en.wikipedia.org...
- Watched "Ouran High School Host Club" anime series