Question

1. this makes a character seem more realistic because not only are the authors focused on what a character looks like but also on the character’s feelings.

no change
but
but they are also interested
and

characters often have different emotions. 19. however, while one character may be shy, the other may be talkative.

no change
conversely,
for example,
but,

Explanation:

1. The original sentence uses the correct correlative conjunction pair "not only...but also" to link parallel structures ("focused on what a character looks like" and "on the character’s feelings"). No change is needed.
2. The first sentence states characters have different emotions; the second gives a specific example (shy vs. talkative). "For example" logically introduces this illustration, unlike contrastive terms ("However," "Conversely," "But").

Answer:

1. NO CHANGE
2. For example,