Ryu Manatsu

Career overview

Role: Meticulous television and film archivist.
Task: Write a career overview of Ryu Manatsu (Acting).
Constraints:
Use ONLY verifiable facts from provided SYNOPSIS and SOURCES.
No invented details (titles, names, dates, etc.).
Original, neutral, encyclopedic prose.
Plain text only (no markdown, asterisks, headings, bullet points).
Word count: 180-260 words.
Structure: 2-3 short paragraphs.
No preamble or JSON.
Name: Ryu Manatsu (真夏竜).
Real Name: Mikio Seto (瀬戸幹雄).
Also Known As: Ryugo Manatsu (真夏竜吾).
Nationality: Japanese.
Professions: Actor, singer, voice actor.
Known For: Acting.
Credits: 14 known credits.
Key Role 1: Gen Ohtori / Gen Otori, the main protagonist and human form of Ultraman Leo (1974).
Key Role 2: Actor in Ultraman Mebius.
Musical contributions: Performed the theme song and two insert themes for Ultraman Leo (1974). The theme song was heard in the first 12 episodes.
Paragraph 1: Identity and general profession.
Ryu Manatsu is a Japanese actor, singer, and voice actor. Also known as Ryugo Manatsu or by his real name, Mikio Seto, he has 14 known credits. His work includes roles in the Ultraman franchise.
Paragraph 2: Specific roles and musical contributions.
He is best known for his role as Gen Otori, who is the main protagonist and human form of Ultraman Leo in the 1974 series. In addition to his acting, Manatsu contributed to the musical aspects of Ultraman Leo (1974) by singing the show's theme song and two insert themes. The theme song is heard during the first 12 episodes of the series. He also appeared as an actor in Ultraman Mebius.
Draft 1:
Ryu Manatsu is a Japanese actor, singer, and voice actor. He is also known by the names Ryugo Manatsu and Mikio Seto, which is his real name. With 14 known credits, his professional work includes acting in various productions.

Manatsu is best known for his role in the Ultraman series. He portrayed Gen Otori, the main protagonist and human form of Ultraman Leo in 1974. Beyond his acting performance, he contributed to the musical elements of Ultraman Leo (1974) by performing the show's theme song as well as two insert themes. The theme song is featured in the first 12 episodes of the series. His work within the franchise also includes acting in Ultraman Mebius.
Word Count Check:
Draft 1 is approximately 130 words. I need to reach 180-260 words.
Expanding (carefully using only provided facts):
I need to elaborate on the details provided without adding new info.
Mention the names again? No, that's repetitive.
Elaborate on the "Known For" and "Known Credits".
Elaborate on the "Ultraman Leo" details.
Let's try to expand the descriptions of the roles and the musical aspects using the exact phrasing provided.
Draft 2:
Ryu Manatsu is a Japanese actor, singer, and voice actor. He is also known by the names Ryugo Manatsu and Mikio Seto, with the latter being his real name. Throughout his career, he has accumulated 14 known credits. His professional background is primarily recognized for his work in acting.

Manatsu is best known for his performance