Sidekick
From Guild Wars 2 Wiki
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A sidekick is used to describe a character of a lower level who joins with or is mentored by a character of higher level and gains temporary additional power which brings them closer to or equal to the level of the higher character. This system allows players with low level characters to play with friends and access content possibly restricted because they don't have sufficient level.
Guild Wars 2 is said to be implementing a sidekick system possibly similar to that used by City of Heroes. The sidekick system has been mentioned in particular association with characters entering World PvP.

