What TSV is
TSV is CSV with tabs instead of commas. Because tabs almost never appear inside a value, quoting is rarely needed and the files are easier to read by eye.
Bioinformatics, log processing, and anyone who has copied a block of cells out of a spreadsheet: the clipboard format is TSV.
What INI is
INI is the oldest configuration format still in daily use: named sections, then key equals value lines.
Windows software, PHP, Git and a long tail of tools that never moved on.
What changes when you convert TSV to INI
The tab is unambiguous, so there is no delimiter to guess. This is the most reliable of the delimited formats to read.
Each row becomes a section named after its first column, with one key per remaining column.
What carries over from TSV to INI
TSV records 2 things about a table that INI has no way to hold.
A line break inside a cell ends the row in INI, so line breaks are replaced rather than carried through.
INI has no header row. The column names are repeated as keys on every record instead, which is why the result is bigger on disk than the table it came from.
The identifier 007 comes out of the INI as 007. Reading it as a number would have made it 7, and an id that changes value is worse than one that stays text.
The role "Analyst, data" survives with its comma, in one cell rather than split across two. That is the first thing to check in any converted table, and the usual place a INI file goes wrong.
The quotes around Jonah "Jo" Pryce are left as a plain quote character in the INI.