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So I recently came across a song called 「未完成」 by Leo Ieiri.  
I know 未完 means "Incomplete" or "Unfinished". I'm interested in knowing what
that 「成」 represents when used after 「未完」 and what are other ways to use it.
CC BY-SA 4.0
2020-01-29T11:26:58.100
74125
2020-01-30T02:01:14.683
2020-01-30T02:01:14.683
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question
meaning parsing prefixes
What part does 「成」 play when tailed to a word?
I think you're parsing it incorrectly... It's 未+完成, not 未完+成.

[未]{み} - prefix, "not yet" "un-"  
[完成]{かんせい} - "completion" "accomplishment" "perfection"
CC BY-SA 4.0
2020-01-29T11:36:37.220
74126
2020-01-29T11:36:37.220
9831
74125
answer