Kobold Avenger
Legend
Also, I suppose in the interest of full disclosure, I should note that I personally find the "misunderstood, good-hearted PC tiefling" trope (where "tiefling heritage" is used as a stand-in for whatever group the PLAYER identifies with but thinks everyone else "others" - which can be something as mundane as "nerd" in the 80's and 90's when being a nerd wasn't cool) to be even more widespread and therefore boring than humanocentrism, which is probably why I missed the change to tieflings... because I actively avoid them (does that make ME prejudiced against them? Perhaps, but it's mostly because I prefer to ask people not to actively try to drag their out-of-game baggage into my escapist hobby).
From 1994: "Tieflings live with both pride and shame of who and what they are. They have no culture of their own, and most are loners, which fits their background. Some slip into the edges of human society, becoming poets and artists who describe the corrupt fringes of the respectable world. Adventurous types often spend their years probing the unexplored edges of the multiverse, be it to survey strange lands or experiment in the forgotten niches of magical science."
"Human's don't trust tieflings (and deep inside they fear them), but they remain inexplicably fascinated by tieflings just the same. The plane-touched are often accused of secret plots and awful alliances - mostly without a shred of proof - because of who and what they are. A tiefling learns early that life is unfair and hard. His reaction is to fight back and never let his foes see the pain. Other people, even other tieflings, simply aren't viewed as allies and often are automatically considered enemies. A tiefling doesn't take a friend until he learns the measure of his companions, and even then he'll never fully trust anyone. 'I watch my own back,' is an old tiefling quip. They maintain no hereditary blood-feuds, but tieflings take care of themselves without any thought of others' problems."
That very much reads like someone who's considered an other.
And note that the original Planescape Campaign Setting didn't have the idea of the other Planetouched races just yet, but that was certainly implied they were connected to the lower planes like they were later, especially after the later Planescape products introduced the Aasimar and Genasi.
Tieflings were never like Drow either. 2e very much had the idea that many Tieflings were either Good or Neutral in alignments (as they could be "any alignment except LG"), and that they were never an exception. Good and neutral Tieflings weren't rarities like good or neutral drow were. 3e may have pushed the "usually evil" thing, but in practice it was mostly ignored anyways.(Think "every PC drow is a Drizz't wannabe" fatigue... when every drow/tiefling wants to be the "exception" and it's gone on for decades so the "exception" has become the rule, it makes the very idea boring. I would actually find the idea of a player that wants to play a Cambion that has fully and unabashedly embraced their evil heritage and revels in their badness compelling at this point.)