Karma is a relic. Unused.
Agent is the browser agent of the person who left the comment. Like saying they use firefox or IE or whatever.
Comment type is either “comment” (or blank for the default case) or “pingback” or “trackback”, basically. You can have custom types, however they generally won’t show up as comments because WP doesn’t know about those types. Adding custom types is possible, but not officially supported yet because the code to support it properly isn’t there.
You’d be much better off storing your type in comment meta for now.
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