Japanese by Example
Learning through examples in manga

わたし from a teenage girl

Vocabulary Explanation: Personal Pronouns

Manga panel from 名探偵コナン showing example of わたし from a teenage girl.
名探偵コナン » Volume 1 » Page 65

Professor Agasa convinces Ran to take Conan in to stay with her and her father.

蘭(らん):
「ここよわたしの家(いえ)…　そして今日(きょう)からコナン君(くん)の家(いえ)…」
“It's here. My home... And starting today, your home...”

Although there are characters this series who use 私(わたし), it’s written out as わたし when Ran uses it. This stylistic choice by the author could be to reflect that she’s not yet an adult.