あたし from a middle school girl

Vocabulary Explanation: Personal Pronouns

Seira learns that Sayaka’s parents have forced her into an arranged marriage engagement, even though she likes Asuka Jr. Seira relays this to Meimi, saying if Saint Tail steals the gifted wedding veil from Sayaka’s home, the engagement will be called off. Before Meimi sets out, Seira confirms her intention to go through with the theft.

セイント・テール:: 「あたしが　もし　さやかちゃんだったら　やっぱり　そんな婚約(こんやく)はいやだもん！」; “If I were Sayaka-chan, sure enough, I'd hate such an engagement!”

Meimi often doesn’t use a personal pronoun due to context not calling for it, but when she does, she uses あたし both in narration and when with Seira. Most of Meimi’s female classmates use あたし as well.

Key Points

1あたし marks Meimi’s own voice

あたし is a casual first-person pronoun often associated with girls and women in everyday speech.

2あたしがもしさやかちゃんだったら sets up empathy

The が after あたし highlights Meimi as the imagined person in Sayaka’s position.
だったら makes the condition hypothetical, so she is saying that if she were Sayaka-chan, she would feel the same.

3いやだもん makes the reason emotional

もん gives a casual, personal justification, like saying it is because she would hate it.

ちゃん is an affectionate, informal suffix attached to names, used mainly for children, close friends, and family members.