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All answers having "On the other hand..." as clue:

2 Character Answers:

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OR



3 Character Answers:

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BUT

RHO

YET



4 Character Answers:

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ELSE



5 Character Answers:

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AGAIN

IFNOT



6 Character Answers:

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RATHER

YESBUT



7 Character Answers:

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BUTTHEN

MINDYOU



9 Character Answers:

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THENAGAIN



12 Character Answers:

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CONTRARIWISE



13 Character Answers:

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ALTERNATIVELY