He is best friends with Oliver and have each others' back and when they argue they both learn to forgive each other because they wouldn't know what to do without one another.
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Kaz pretended that Skylar was his girlfriend, but apologized to her after she found out.
Kaz has a problem with authority therefore he can't always make right decisions and he her, telling him that saving the world comes first, even if it means taking her being more competitive than him. When Skylar turned evil, Kaz would remind Oliver to move past his personal feelings for can be very competitive even about the smallest things like being taller than Oliver and down. Kaz is a laid-back guy who, unlike Oliver, doesn't think before his actions.