I would say that a character who is a stereotype has an over the top, exaggerated personality.
I think it is a run-on sentence.
Answer:
A conjunction
Explanation:
In order to make a compound sentence, two independent clauses need to be joined with a conjuction. Use the abbreviation FANBOYS to help remember some common conjunctions.
F- For
A- And
N- Nor
B- But
O- Or
Y- Yet
S- So
Hope this helps! :-)