Halo effect

What it is

Letting one good impression (looks, charm, one success) colour judgment of unrelated traits; the reverse, from one bad trait, is the horn effect.

Example Assuming a good-looking candidate is also competent and honest.

Appeal to authority fallacy
An expert in one area gets credit in others through the halo effect.
Affect heuristic bias
A good feeling about one aspect spreads to the judgment of others.
Authority bias bias
A title or expertise in one domain spreads to others.
Liking bias bias
Liking someone makes us judge their other traits favourably.
Non sequitur fallacy
"She's charming, so she must be right" is a non sequitur carried by the halo effect.
Stereotyping bias
Both let one characteristic stand for many others.
Poisoning the well fallacy
Poisoning the well uses the halo (horn) effect deliberately: a negative first impression colours everything that follows.
What you see is all there is bias
Judging the whole from what is visible, such as one good trait, makes the halo.
Domain dependence bias
Success in one field is assumed to imply competence in another.
Sleeper effect bias
Source credibility colors a message at first; as the source fades, only the message's own appeal is left.