https://www.collinsdictionary.com/dictionary/english/might says:
3. MODAL VERB
You use "might" to indicate that something could happen or be true in particular circumstances. (emphasis mine)
a) Your child might do better with a different teacher.
b) (He is) the type of person who might appear in a fashion magazine.
Q1) I think the condition for sentence a) is: "If she had a different teacher." Am I right?
Q2) What is the condition for sentence b)?
g. if he wished to pursue that career, if he was spotted by a fashion editor, if we happened to pick up up the appropriate magazine and spot him there, etc. The point of the sentence is to tell us about his appearance, and in normal reading we would not be concerned about a specific condition (unless extra context directed us towards one).
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The condition for (b) is rather vague, and could include any circumstance that would cause the stated thing to happen, e.g. if he wished to pursue that career, if he was spotted by a fashion editor, if we happened to pick up up the appropriate magazine and spot him there, etc. The point of the sentence is to tell us about his appearance, and in normal reading we would not be concerned about a