Userboxes are a fun and handy way to learn about Wikipedia contributors, though they can also be needlessly-divisive if used inappropriately. This page lists the rest of mine, so the information box on my userpage doesn't become too ridiculous.

Important Wikipedia Boxen

Babel and Relevant Skills
en-au This user is a native speaker of Australian English.	en-sg-2 This user's Singlish not very good lah.	Hrkt- 1 あ This user has a basic understanding of the Katakana or Hiragana.
This user is a technical writer.	{{ t| 3}} This user contributes to the template namespace with confidence.	{{Wiki}} This user can write in the MediaWiki language.
css-2 This user is an intermediate Cascading Style Sheets user.	-3 This user is an advanced LaTeX user.	This user operates an installation of MediaWiki.
< html> This user can write HTML.	Lua-1 This user is a beginning Lua programmer.	svg This user can write SVG.

Community
Human This user is first of all a human being.	This user believes in civility and assuming good faith.	This user does not understand mean people. Please be nice.
This user wishes he could thank bots.	This user provides information using userboxes to contact other Wikipedians with similar interests.	This user does not insult vandals.
This user knows technical accuracy is necessary but insufficient for productive discussions.	This user is a donor to the Wikimedia Foundation. You can be one, too.	This user thinks you can learn a lot by editing an Encyclopedia.
This user's editing philosophy... Contribute, let go	This user maintains a strict policy advising against all personal attacks.	This user tries to do the right thing. If he makes a mistake, please let him know.

Wikipedia Profile and Editing Boxen

Personal
This user edits using their real name.	Y This user is a member of Generation Y.	This user supports the fight against breast cancer.
This user maintains a blog at Rubenerd.com.	This user posts on X as @Rubenerd.	This user has an account on GitHub.
This user comes from Australia.	This user is a former resident interested in Singapore.	This user is a former resident interested in Malaysia.
AISS This user attends or attended the Australian International School Singapore	UniSA This User attends or attended the University of South Australia.	UTS This user attends or attended the University of Technology Sydney.

Account
This user has extended confirmed rights on the English Wikipedia. ( verify)	This user has autopatrolled rights on the English Wikipedia. ( verify)	This user has pending changes reviewer rights on the English Wikipedia. ( verify)
This user has been editing Wikipedia for more than 15 years (19 years, 6 months, and 6 days).	ID This user's ID is 142,181.	# of users There are currently 47,575,230 users on Wikipedia, and this user is one of them.
0.0019%  This user has created 129 of the 6,838,959 articles on the English language Wikipedia.	4.5k+ This user has made over 4,500 contributions to Wikipedia and knows this is a meaningless statistic.	This user has alternative accounts named Rubenerd, RubenShade.
This user has contributed 57 images to Wikipedia and Commons.	This editor has been awarded the Music Barnstar	This editor is a Yeoman Editor and has automagically been awarded this Service Badge.
This user has created a global account. RubenSchade/Userboxes's main account is on Wikipedia (in English).	This editor is a Grognard Extraordinaire and has automagically been awarded this Wikipedia Vest Pocket Edition.

WikiProjects and Focus
This user is a member of the Association of Structurist Wikipedians.	This user is a participant in the Trains WikiProject.	This user is a participant in WikiProject Jazz.
This user is a participant in WikiProject Wikify.	This user is a member of the Antarctica Highways WikiProject.

Editing
< ref> This user recognizes the importance of citing sources.	refs= This user uses list-defined references. Here's how.	This user prefers citation templates.
struc This editor is a structurist.	This user likes to keep things organized.
[[]] This user uses the source editor as his primary editor.	This user reserves the right to completely screw up his own edits.
_ This_user_dislikes_seeing underscores_in_Wikilinks.	IA This user uses the Internet Archive.
This editor thinks that all articles should have an infobox.	This editor thinks that all articles should have images and diagrams.
This editor is a WikiGnome.	This user uses HotCat
What did you do? This user includes edit summaries in their contributions and thinks that everybody should use them as well.	~~~~ RubenSchade signs his posts and thinks you should too!	This user repairs links to disambiguation pages.

Other Wikipedia-Related
Mono Book This user changed their default Wikipedia skin back to MonoBook.	This user loves Wikipe-tan, the cutest personification of Wikipedia.	Editing Wikipedia is something this user does as a hobby.
This user just created the above userbox.	This user enjoys reading The Signpost.	This user has a fantasy metro line!

Boxen For Fun

Advocacy
This user prefers the metric system.	00:00 This user uses 24-hour time.	W3C This user believes in compliance with W3C standards.
This user supports public transit.	This user is a member of the SOS Brigade – Wikipedia Branch.	This user does not like socklessness.

Infocomm
This user's favorite subject is computing.	This user is interested in retrocomputing.	This user really likes old computers.
This user contributes using macOS.	This user contributes using FreeBSD.	This user contributes with XFCE.
C:\>_ This user uses DOS, or knows how to use it.	Unix This user can program in Unix.	Perl This user is just another Perl hacker.
sh-3 This user is an advanced Bourne Shell programmer.	py-2 This user is an intermediate Python programmer.	rb-2 This user is an intermediate Ruby programmer.

Interests
This user is interested in Asia.	This user is a Japanophile.	This user likes subway maps
This user has a place in his heart for good coffee	This user loves a good cup of tea.	This user is interested in flags and emblems.
This user is interested in Science.	This user enjoys skygazing and astronomy.	This user is interested in Chemistry.
This user is an Americophile.	This user is interested in 20th-century history.	This user follows the FINA Diving World Series.
This user is interested in architecture.	The Norfolk pine (araucaria heterophylla) is the tree with which this user is most enamoured.	This user likes Fractal designs.

Media
This user is an anime and manga fan.	This user enjoys Hong Kong films.	This user enjoys writing.
This user enjoys reading mysteries.	This user reads science fiction.	This user enjoys reading non-fiction.
This user is an aspiring writer of delightful science-fiction.	This user likes to read reference books, like encyclopedias and atlases.	This user enjoys photography.
This user listens to Whole Wheat Radio	This user lets in tigers from the rain.	This user enjoys jazz music.
Blue This user enjoys The Blues.	This user enjoys J-Pop.	This user enjoys electronic music.

Entirely Pointless
EX This user is an expert in his field of expertise.	"... pulling rabbits out of hats. Sometimes I'd prefer somebody wear them... ♫"	PAGEID The ID of this page is 34151832.
WIKIPEDIA, The Free Encyclopedia. W	This user is a mammal.	This userbox is ... loading.
"I never said that." – Anon	Name This user's name is not Siegfried.	ubx This user uses userboxes.
This user often makes mistakes while typing, and would like to take this oppurtunity to aoplogiae.	— This space is for rent.	${\displaystyle \lim _{t\to \infty }(Wikipedia[t])=}$ 42
UBX This user has way too many userboxes	This user prefers bagels to bagels.	This user has no userboxes on his userpage.

Travel For Fun

Boxen
This user has lived in 3 countries of the world.	18 This user has visited 18 of the 208 countries in the world.	This user comes from Sydney.
Kyōto is this user's favourite city.	This user has been to and loves New York City.	This user left his heart in Hong Kong.
This user has visited all six states and two of the three territories of Australia.	This user has visited 4 of the 47 prefectures. 4	Dieser Benutzer hat 2 von Deutschlands 16 Ländern besucht. 2
This user has visited 5 of the 27 EU Member States. 5	This user has visited 4 states and 1 territory of Malaysia.	This user has visited 4 of the 50 United States. 4
This user is a railfan.	This user rode the Shinkansen	This user rode the Acela
This user is interested in aviation.	This user's favorite airport is Singapore Changi Airport.	SQ This user's favorite airline is Singapore Airlines.