Do AIs Need 'Persona Settings'? The Difference Between Effective Roles and Ineffective Titles | 10 Copy-Paste Templates

Hello everyone.Midnight Latte here.

Are 'persona settings' necessary for AI, or not?

"You are a top-tier marketer," "You are a professional editor"—have you ever heard that it's good to attach these kinds of "titles" at the beginning when asking an AI to do something?

But when you actually try it, you might feel that the answer doesn't change much whether you include them or not. Many people probably continue doing it vaguely, wondering, "Is there any point to this..."

I'll give you the conclusion first. You don't need "inflated titles." But you do need "roles."

It may sound contradictory, but it isn't. Tonight, I will organize the boundary between them, along with copy-paste templates you can use.

Why "titles" don't work

AI is a tool that "fills in missing information with average values." What's important here is that titles contain almost no "information."

Writing "You are a genius marketer with an annual income of 100 million yen" doesn't actually improve the AI's capabilities. The AI just answers with the power it already possesses, and the title is merely decoration—sometimes even noise.

In other words, what doesn't work isn't the "role itself," but rather the "inflated title" that lacks substance.

"Titles" and "roles" are different things

Even when "assigning a role," there are things that work and things that don't.

• Ineffective (decoration): "You are a genius marketer with an annual income of 100 million yen"

• Effective (functional): "Please read as a proofreader," "Please explain as a teacher"

The latter works because it makes the AI choose "which perspective (mode) to answer from." If it reads as a proofreader, it adopts the eyes of a "proofreader," and if you make it an idea generator, it adopts a "divergent" mindset. A role is a switch that changes the direction of the answer.

Situations where a persona is "needed / not needed"

Once you can distinguish this, you won't be confused anymore.

Situations where a role is 'needed'

• Even with the same information, when the answer changes depending on the perspective

• Example: Whether you want the text 'polished' or 'critiqued'

Situations where a role is 'not needed'

• When the perspective is irrelevant, tasks where there is only one correct answer

• Example: Simple calculations, translation, fact-checking, date conversion

Specifically, it looks like this correspondence table.

So, what actually works?

What moves the needle more than a role are these three things:

1. Premise (Context): Who is this for, and what is the purpose?

2. Output Format: Character count, bullet points, tables, etc., the visual structure

3. Constraints: Things you don't want done (no sensationalism, no jargon, etc.)

For example, just saying 'think of a title' is weak.

The role is just the 'trigger', but the remaining three determine the effectiveness. This is the essence.

10 Copy-Paste Templates by Situation

Just fill in the [ ]. Everything is standardized as 'Role -> Premise -> Request -> Output Format -> Constraints'.

1. Catchphrases and Titles

あなたは反応率を重視するコピーライターです。
[商品・記事の内容]を、[ターゲット]に向けて訴求します。
クリックしたくなるタイトルを10案ください。
各30字以内、煽り・誇張・「！」の多用はNG。
案ごとに「狙った感情（不安／好奇心／お得感 等）」を一言添えること。

2. Proofreading and Rewriting Text

あなたは丁寧な編集者です。
以下の文章を、意味を変えずに読みやすく整えてください。
重視点：冗長な表現を削る／一文を短く／主語と述語を近づける。
出力は「修正後の全文」→「主な変更点を箇条書き」の順で。
原文にない情報の追加はしないでください。

[ここに文章を貼る]

3. Simplifying Specialized Knowledge

あなたは[分野]を初心者に教えるのが上手な先生です。
[知りたいこと]を、予備知識ゼロの大人にもわかるように説明してください。
専門用語は使うたびに（）で短く言い換える。
身近なたとえを1つ以上入れる。
最後に「3行まとめ」を付けてください。

4. Checking for Omissions and Counterarguments

あなたは厳しめのレビュー担当です。賛成意見は不要です。
以下の[企画／文章／計画]について、
「弱点・抜け漏れ・想定される反論」を重要な順に5つ指摘してください。
各指摘に「どう直せばよいか」を一言添えること。

[ここに対象を貼る]

5. Parenting Advice

あなたは経験豊富で、親に寄り添うのが上手な保育士です。
[子どもの年齢・状況]について相談です：[悩み]。
否定や正論の押しつけはせず、まず気持ちを受け止めてください。
そのうえで、今日から試せる具体策を2〜3個、優先順位つきで。
医療や安全に関わる場合は、専門家への相談を促すこと。

6. Refusal and Negotiation Emails

あなたはコミュニケーションの専門家です。
[相手]に[用件：断り／日程変更／値下げ交渉 等]を伝えるメール文面を作ってください。
関係を壊さないトーンで、結論を先に、理由は簡潔に。
丁寧すぎる前置きや過剰な謝罪はカット。件名案も3つ添えること。

7. Troubleshooting Errors and Bugs

あなたは原因の切り分けが得意なシニアエンジニアです。
環境：[OS／ツール／バージョン]。やりたいこと：[目的]。
起きていること：[エラー内容・症状]。
いきなり結論ではなく「疑われる原因を可能性の高い順」に挙げ、
それぞれ「確認手順」と「直し方」をセットで示してください。

8. Planning Schedules and Meal Menus

あなたは段取りの良いプランナーです。
目的：[例：平日5日分の夕食を時短で回す]。
制約：[調理時間・人数・苦手な食材・使える家電など]。
条件内で最適な[献立／スケジュール]を表で提案してください。
表の列は「日／メニュー／調理時間／ポイント」。
買い物リストも最後にまとめること。

9. English Learning

あなたは学習者のレベルに合わせて教える英語の家庭教師です。
私のレベル：[例：中学卒業程度／TOEIC500]。目標：[例：TOEIC800]。
今日のテーマ：[文法項目／場面]。
説明は日本語で、例文には必ず和訳を付けてください。
最後に私のレベルに合った練習問題を3問。解答は求めたら出すこと。

10. Summarizing Long Texts

あなたは要点抽出が得意なリサーチアナリストです。
以下の文章を、忙しい人向けに要約してください。
出力は「30字の一言まとめ」→「要点を箇条書き3〜5個」→「注意点・反対意見（あれば）」の順。
原文にない解釈や憶測は足さないこと。

[ここに本文を貼る]

The '5-Second Checklist' Before You Send

• ☐ Does the answer to that question change depending on the 'perspective'? → If yes, assign a role

• ☐ Are you just padding the title as 'decoration'?

• ☐ Have you provided the premises (who it's for, what it's for)?

• ☐ Have you specified the output format (character count, bullet points, tables, etc.)?

• ☐ Have you written down what you don't want it to do (constraints)?

Conclusion

The answer to 'Do you need a persona or not?' is,you don't need decoration, but you do need a functional role.

It was more important to carefully provide the premises, format, and constraints than to pad the title.

Thank you for reading. See you in the next article.

★
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