Lore wise, Warlocks are the most interesting as they are always wanting to expand their knowledge and understanding of the worlds they explore and the beings they encounter.
Hunters are very much outcasts and explorers and are mainly used for scouting and recon missions.
Titans, in my opinion, are the least interesting. They're just muscle and are used for their brute force and high defense value.
There's my two cents.
English
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Hunters are used to seek out and exterminate the enemy. They are the Special Forces of Destiny.