Japanese望月けい is on Twitter (X) as @key_999, with 1,096,478 followers and 67,130 posts. A typical post draws 2.3K interactions, an engagement rate of 0.213% per follower. It has been on X since July 2010, an account age of 16 years.
Insights
Its strongest tracked day added +14 followers on Jun 24, 2026.
Engagement
A typical post picks up 2.3K interactions against 1.1M followers, an engagement rate of 0.213%. Measured over 14 original posts, its engagement rate beats 82% of 21,397 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 269K times each, and 0.869% of those impressions turn into an interaction. That is about 24.5% of the follower count, which is the gap between an audience on paper and an audience in a timeline.
Measured over 14 original posts from a 30-day window, last computed on October 30, 2026. Recurring tags: #リボンヒーロー, #ツイステ, #theribbonhero.
Full engagement reportFollower growth
Best tracked day: +14 followers on 2026-06-24.
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Bio
kei Mochizuki / Illustrator アニメと絵が好きです ▶︎ アニメ「リボンヒーロー」/ LOOPERS / 第四境界 / レーミク2025 / FGO「バーヴァンシー」/ 刀剣乱舞「京極正宗」/ サンリオ「シエロモート」キャラデザ
Notable followers
The biggest accounts in our directory following @key_999.
望月けい on Twitter (X) - frequently asked questions
- What is the Twitter handle for 望月けい?
- 望月けい posts on Twitter (X) as @key_999. The profile is at x.com/key_999, and the View on X button at the top of this page opens it.
- How many followers does 望月けい have on Twitter?
- 望月けい (@key_999) has 1,096,478 followers on Twitter (X). The count is refreshed continuously from public data.
- When did 望月けい join Twitter?
- 望月けい joined Twitter (X) in July 2010. The @key_999 account is 16 years old. Searches for 望月けい age often mean a personal age, which we do not publish. The figure here is the account age only.