Hmm... elf companions so far:
-Sketch: Sort of gives the view of an apostate hireling.
-Zevran: City Elf(?) with a Dalish mother, gives view of an elf who is assimilated into his national culture, seeing himself as Antivan, still slightly sympathetic to other elves, but not making it a personal mission.
-Velanna: Dalish extremist, to the point where she is exiled. Shows the extremes of Dalish.
-Ariane: A nice Dalish warrior, proud, honorable, kind, friendly.
-Fenris: Ex-slave, mage hater, Tevinter perspective... not much opinion on Dalish or City Elves that I can remember, too obsessed with mages.
-Merrill: Cheery, bubbly, Dalish mage goof... gives a slightly rebellious view of Dalish magic and shows confusion over the Circle system.
-Tallis: Qunari...ish.
I suppose it would be nice if an elf Templar was charismatic and very encouraging to other City Elves (maybe use the Chant when talking to Andrastian elves?), with a rational, hopeful attitude. Just to be different from the others.
That, or a coward who is crying all the time... but I don't think anyone wants a companion like that...