If it's just a character's name (unless there are special circumstances), all of that character's works will have their copyright expire in 2026.
First, according to US standards:

All Quiet on the Western Front

Betty Boop (early version only)

Pluto
Mickey Mouse's copyright has already expired, but the episode where Pluto first appears will have its copyright expire in 2026.

Dream a Little Dream of Me

Body and Soul
Livin' in the Sunlight, Lovin' in the Moonlight
Livin' in the Sunlight, Lovin' in the Moonlight
This isn't about the SpongeBob version's copyright expiring, it's just famous because it appeared in SpongeBob, so I included it. Apparently, it was a song from a not-so-famous movie that appeared briefly? When the movie's copyright is released, the song's copyright is released too.
If it's 70 years after death, copyright expires -> Works by people who died in 1955 will expire.
사후 70년이면 풀림 -> 1955년에 사망한 사람들의 작품이 풀린다

알버트 아인슈타인

알렉산더 플레밍

데일 카네기 (인간관계론)

This is that Léon Werth mentioned in the preface of The Little Prince.
어린왕자 머릿말에 나오는 그 레옹 베르트임

토마스 만 (베네치아에서의 죽음)

Source: Sing-geul-beung-geul Global Gall [View Original]
출처: 싱글벙글 지구촌 갤러리 [원본 보기]
"Folks are hyped about old IPs going public domain, some confused about what exactly is expiring, and others already plotting their next move with these new 'freebies'."
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