10. Kim Sang Hyuk and Chan Joon Sang from Winter Sonata, 9. Echizen Ryoma and Echizen Nanjiro from Prince of Tennis and!?
In terms of sheer determination I would say Vegeta's rivalry with anyone stronger than him, mainly Goku, takes the top spot! I mean the guy was hell bent on surpassing Goku for 250 + episodes, if that aint reason enough to include this rivalry on this list, I dont know what is!
What about Ryoko and Ayeka? They were always at each others throats =p
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