Zero & Kaito

ZERO AND KAITO
Zero and Kaito have a rather long history, their story together is dated way back when they both trained under the currently top ranked Vampire Hunter... Toga Yagari~ who was actually Zero's and Ichiru's teacher before Kaito joined the posse after his teacher had become injured and was no longer able to carry on his teaching methods to his student. The two of them however, did spend many years apart after Yagari left zero in the care of Kaien Cross before leaving to investigate the murder of Zeros parents and twin brother (who was later found to be alive). After these many years of seperation, Kaito finally meets his training buddy again in the chapter called "53rd Night: Accidental Encounters", not long after this the two of them became what is better described as "hunting buddies" in which the follow the commands of the Hunters Association together as a silent team.

Kaien Cross often exclaims about how similar they both are mentally; and how both of them are Yagari split in two. Sometimes its shown that Zero often puts Kaito to shame. However, in most cases... Kaito returns the favour.