I have some ideas about heroes for Arnor, if you want to remove Glorfindel (and I think, that Araphant is just... well, his presence in the mod, doesn't convince me too much).
Argeleb I - He was in original campaing od RotWK, and he tries to reunite all Arnor. Cardolan accepted this, but he was forced to start a war with Rhudaur, which was already under the influence of Witch-King of Angmar. And he fortified Weathertop.
Arveleg I - Also present in OC. He leads His mens, peoples of Cardolan and elves of Lindon to war against WK and for some time, was victorious by droving back Angmar forces. But, afterall he was killed during defending oldest tower in Amon Sul, where palantir was stored. With this, he made possible to rescue other dunedains to rescue palantir and take it to Fornost.
Argeleb II - Founder of the Shire during the Great Plague, tenth king of Arthedain. He was buried in Cardolan's Barrow-downs. Frodo was cought in his mound, it's possible, that he was cought by Argeleb himself.
Arahad I - Seventh chieftain of the dunaedains. During his life, it was discovered, that Sauron returned to Dol-Guldur, Misty Mountains was raided by orcs again and Celebrian was captured, tortured, rescued and she left Middle-Earth. Oh, also White Council was founded, and he was member of it (if I'm correct, there was ever only one mortal human, which was member o WC, and it was him).
So... what do you think?