Hardcore crowd (gachi-zei)
Overview
Gachi-zei (the hardcore crowd) is slang for people who take a particular activity seriously. "Gachi" means "serious," and "zei" means "the people who belong to that group." The opposite is "enjoy-zei" (the casual crowd), meaning people who put having fun first without caring about winning, losing, or results.
It was originally a gaming term, but it's now used for all sorts of hobbies and activities. The hardcore cooking crowd, the hardcore weight-training crowd, the hardcore crowd of fans supporting their favorites (oshi-katsu). It's a word that expresses a high level of seriousness, and it's basically used with a positive nuance.
How gachi-zei is read and where it comes from
Gachi-zei is read "gachi-zei." It's easy to misread the second part as "sei," but in this word it's pronounced with the voiced sound "zei."
"Gachi" is slang said to come from the sumo term "gachinko" (an all-out, serious bout), and means "serious" or "in earnest." "Zei" is a suffix meaning "the people who belong to that group," as in gunzei (an army) and ozei (a crowd), and it spread from the culture in online gaming communities of labeling player groups as "X-zei." In short, gachi-zei is a single word for "people who take something seriously."
Contrast with the casual crowd, and example sentences
Gachi-zei is often used as a pair with enjoy-zei. While the hardcore crowd takes things seriously and aims to improve or achieve results, the casual crowd's goal is the fun itself, without caring about winning or losing. Neither is better than the other; the words describe different attitudes toward the same activity.
Here are some real examples. Example 1: "That person's answers are long and careful every single time. They're totally part of the hardcore question box crowd" (admiring how serious someone is). Example 2: "I'm in the casual crowd, so I only answer when I feel like it" (stating your own stance). Example 3: "Reading answers from the hardcore crowd teaches me a lot" (a positive view of the hardcore crowd).
Calling yourself gachi-zei can sometimes sound like bragging, so it's also often used in a modest opener like "I'm not exactly hardcore, but." When used about other people, it's basically a compliment that carries respect for how serious they are.
The question box hardcore crowd
Question boxes have a hardcore crowd too. On the answering side, the hardcore crowd spends time on each answer, polishes their writing, and reads deeply into the sender's intent before answering. They care about the design of their question box, find clever ways to share their answers, and think strategically about building relationships with followers.
There's a hardcore crowd on the sender's side too. They read through the past answers of the person they're asking before coming up with a question, and craft questions that are easy for that person to answer and can still draw out a fun answer. They're people who take sending good questions seriously. Questions from the hardcore crowd are rewarding for the person answering, too.
Hardcore and casual crowds living side by side
A question box community has both a hardcore crowd and a casual crowd. When the hardcore crowd demands that the casual crowd "ask more serious questions," or the casual crowd teases the hardcore crowd with "you don't have to take it that seriously," the atmosphere of the community can go sour.
What matters is respecting both styles. There's no right way to enjoy a question box. Putting serious work into crafting your answers and answering casually in a word are both perfectly fine ways to use a question box. Stick to your own style without dismissing other people's. This attitude leads to a question box where all kinds of people can live side by side.