Compare Omin to Ayofell (or however you spell Wil Weaton's character's name). Can you really say that Ayofell is not a memorable elf?
I dunno, I think here you just torpedoed your own point, as Ayofell is not an elf. Eladrin are far more distant from elves than half-elves are from humans, yet you cannot distinguish between the two.
Moreover, in 4e, half-elves are not all that distinct. They are not inherently distant from both elven and human societies but adept at both. "They are charismatic, confident, and open-minded and are natural diplomats, negotiators, and leaders." "Half-elves naturally inspire loyalty in others, and they return that feeling with deep friendship and a keen sense of responsibility for those who place themselves in their care. Half-elf warlords and generals do not order their followers into danger that they would not face themselves, and they usually lead from the front, trusting their allies to follow.
Half-elves have no culture of their own and are not a numerous people. They usually bear human or elf names, sometimes using one name among elves and a different one among humans. Some are anxious about their place in the world, feeling no kinship with any race, except other half-elves, but most call themselves citizens of the world and kin to all. " PHB pg 43
How does that not describe the cleric's personality? He leads a group of loyal allies into battle, ensuring their safety. Omin does often take the lead for negotiations, which is perhaps the most defining trait of the half-elf.