I find it really annoying that while you support NaruHina and IchiHime, you relay hate upon Sakura and Rukia. Let me tell you my friend that no character deserves hate. There are there for a reason.
In Naruto, most say Sakura is a character that is obsessed with Sasuke and only gets in the way when it comes to a fight. Now, let me tell you this. Sakura's character is not annoying. In the series she's described as a very talented ninja, first in her class (female) and when it comes to fighting she's often cast aside because the boys, Naruto and Sasuke, have this syndrome that all anime boys have, called "knight-in-shinning-armor". Now at first she might have been conflicted about fighting, but in time her character developed in an amazing fighter. She became a medic ninja because she felt useless (I still blame the boys on that part) and she wanted to not be held back by them. You say Sakura is a "violent fangirl", while most might be true (the violent part...*shudders*), let's not forget that she's the one who always saved their asses every single damn time with her damn medic-ninjutsu. As for the fangirl, let me tell you the case is just like you said about the IchiHime theory. SasuSaku one-sided love was there from the beggining and it's canon. It was there from the start, it begun with a crush and attraction and then bloomed into something called love. She never saw Naruto as the second choice, if so she would have encouraged him that he may have a chance with her. She was his first crush, that's why Naruto couldn't look at any other girl differently. Because as a first love, she was kinda number one in his heart (like everyone else).
And let's not forget that Hinata was also a fangirl. She stalked Naruto everywhere and watched him from afar, but even though it was creepy at first (come on, we all thought that.) she learned and tried with him. The "ninja way" Naruto always mumbled passed on to her and she started training to get stronger and catch up to him. And in the fight against Pein, I think that it was coincidental that Hinata was there. Naruto transformed to the Kyuubi because Hinata was pierced and thought of being dead, yes. But till then, Hinata was one of his friends, nakama. All of the Rookie 9+Team Guy are dear to him, so I think that either Hinata, Kiba, Shino, Shikamaru, Ino, Choji, Sakura, Lee, Tenten or Neji being pierced, Naruto would have gone berserk too. Imagine in Hinata's place being Konohamaru... He is thought of being Naruto's little brother. Imagine him being pierced. What would you think it would have happened?
The same in Bleach. You say Rukia is a spoiled brat who cries to get what she wants. I don't know about you but I've never seen Rukia cry. Maybe when she was forced to kill Kaien. And maybe when Ichigo, Renji or Byakuya were severely injured... Yes she is hotblooded, yes she is prone to injure Ichigo and Renji, but she's only doing that because she needs them to get over whatever they are depressed about and get on. Rukia is a strong character and amazing and you shouldn't hate her just because she is the female lead and paired with Ichigo. Rage blinds people from seeing the usefulness of the character. Rukia represents one half of Ichigo's power. She ignited them when she gave him hers in the first episode (because they were dormant). She's his will and keeps him level-headed when he's moping around (after the fight with Yammi). I believe there was an attraction at first, but because Renji butted in his smexy ass, their relationship remained on a brotherly-sisterly way. They are best friends and act like it. Besides, Rukia is the first IchiHime supporter, people should take example from her. She already knew Orihime's feeling for Ichigo and Orihime had wormed into her heart and now she's her best female friend. She helped Orihime get stronger when they went in SS.
Rukia is representing everyone's will, I believe. She knows exactly what it needs to be said when it's needed. She just has a violent way of saying them. And the woman is STRONG. Tell me, would a "spoiled brat" manage to kill her beloved lieutenant (who she admired) because he asked her? Would a "spoiled brat" surrender to save her friend from being killed? Would a "spoiled brat" barge into another world to save her best female friend knowing she might die in the process? Would a "spoiled brat" defeat an Espada (even though he was number 9 he still WAS a freaking ESPADA) with JUST her SHIKAI? Both Ichigo and Renji had to go into Bankai and battle the same opponent twice or more (Yammi, Ulquiorra, Grimjaw etc.) in order to finally defeat them. I think she was quite awesome when she defeated ArruNierro (or what's-his-name-was) and STILL had the will to move because Orihime NEEDED HER.
Don't tell me or any other true fan of both Bleach and Naruto that Rukia, Sakura or anyone else is useless.
They are all awesome, and if they were annoying the mangakas wouldn't have bothered to actually create them.