A Tag-along is a member of the party with little to no signifigant role. The reasons of a Tag-along joining the party span from protection purposes to a promise to meet again to a means of getting to his/her home dimension.
Jobs
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Contributing to the fight
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Some Tag-alongs will provide assistance to the main characters in battle.
Providing support
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A Tag-along will often stand at the sidelines of a fight cheering for the fighters. At times, they would step in and give them a little help.
Assistance
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Based on his/her special skills, a Tag-along will be assigned to help a main character in a mission.