I have a Charr Engineer and an Asura Engineer. The Charr takes much more damage when kiting. Enemies that chase my zippy lil' Asura trying to hit her just stand there swinging away at my fat Charr not needing to chase him.
(Yes I know they would hit both from the same spot when attacking because of the hitbox being equal, I'm talking about them deciding between attacking or moving closer. The AI )
My mad art skillz:

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