Nifft
Penguin Herder
As a counter-example, consider the Dex-based Ranger who uses a Hunting Greatspear. This weapon has the property that it is Heavy Thrown 10/20.Rare = character-defining, right?
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4e toned-downed magic items so that I don't think there are any that are really "character-defining" any more. That's not necessarily a bad thing, by the way.
Around mid-paragon, he becomes a mobile zone of control who can slide and prone (and then shift 2) on an OA, and who gets an OA if you try to charge him. He's comfortable in melee and brutal at range, and he hinges on being able to chuck his greatspear.