Going with Simca all the way! I don't like Kurura, she is boring. They would have a lame relationship. And Ringo gets on my nerves though the his she stole was pretty sweet. Whatever that means.
Original Works Bleach Works
Kururu ftw. She and Ikki have the most honest and straighforward attraction and they both show signs of liking each other. Also, the good relationship with his own tunern will help him in his trekking ventures and tropaelium.
Ringo has had political and betrayal issues and her relationship with Ikki is not analogous to Sora/Rika's. She's too submissive for anything good to happen to her right now.
Simca is just one of those flirtatious exploiters. Obviously she has some sort of deep relationship with Kilik or whoever the other guy at the top of Tropaelium was.
Kururu is da best!!!!
about Kururu, I agree with you saying Kururu fitting a best friend role...But she seems to understand people's feelings quite well...when Simca was attacked and ikki was going all berserk, kururu understood ikki's feelings and calmed him down.
I like Ringo
but I hate Ikki
so the best choice is kururu.