Hi, I'm Jo King, a moderator on Code Golf.
My favourite tags are quine, polyglot and restricted-source.
Usually using languages like:
- Raku (formerly known as Perl 6)
 - brainfuck
 - Befunge-93
 - ><>
 
Less often:
- Python 3
 - Hexagony
 - Befunge-98
 - Brain-Flak
 - Lost
 - Gol><>
 - APL
 
Languages I've created
- Cascade, a 2D language where you can only move down
 - Backhand, a 1D language that's interesting to golf
 - Symbolic Raku, a restricted subset of Raku that disallows alphanumeric characters
 
Posts I'm proud of:
- Cyclic Levenquine (Gol><> 167 bytes)
 - Golf you a quine for great good (Hexagony, Lost)
 - Klein Topololyglots (37 bytes)
 - Geiger Counter (Lost, Hexagony, SMBF)
 - Halting Problem Paradox (brainfuck, 4376 bytes)
 - Mutually Exclusive Quines (><>, 42+42=82 bytes)
 - Hello, World! (Hexagony, 29 bytes)
 
If someone comments on a question "I wish there was a brainfuck solution", I feel obliged to provide one.