AD Casters rely more on their skill-set for damage as opposed to an AD carry which rely on auto-attacks. One key requirement is for their skills to scale well with Additionally in terms of play style most AD casters will have and use their gap closers to initiate on an enemy whereas an AD carry generally reserves them for kiting AD casters generally do not require attack speed in their build, but since their positioning is generally more dangerous than that of an AD carry survivability might become a problem. In some cases early defensive items and careful positioning might be required if you find yourself unable to finish your burst.
A couple of ChampionPosition champions are:
Wukong
Zed
Pantheon
Riven