Rena Sayama (ULTRAMAN)

Rena Sayama (佐山レナ) is a popular singer and the daughter of police officer Endo that appeared in ULTRAMAN manga. Her real name is actually Rena Endo (遠藤レナ).

Ultraman (2011 Manga)
A young Idol around Shinjiro's age, Rena became a fan of Shinjiro's after his numerous crime fighting exploits wearing his Ultraman suit. While her agent just denounced him a cosplayer, Rena was quick to defend him as the real thing. While on their way to an appointment, the two were stuck in a strange traffic jam caused by Shinjiro's battle with another alien. The pair landed nearby with Shinjiro landing on the hood of their car. While the alien belittled Shinjiro and destroyed his confidence, Rena and her agent had snuck out of the car. Hearing her hero being trash-talked, Rena called out Ultraman and gave him back his confidence. Unfortunately, this angered the petty alien who fired Plasma bombs at her. Fortunately, Shinjiro was able to stop the attacks with his Light Swords.

After the battle, she went to the hospital to be treated for minor injuries when she ran into her dad Endo, who was relived she was alright. Unknown to either of them, the Four eyed alien watched them drooling from outside.

Later, she appeared on TV talking with a news anchorman about the recent alien battle and whether the Earth was being targeted again by aliens. Rena was a staunch supporter of Shinjiro declaring that he was 'Ultraman' not a pretender.

Trivia

 * Rena made her first technical appearance back when Shinjiro first fought Be Mular, they two met on a billboard advertising her third and latest single UltLove (ウルトラブ).
 * It is unknown if Rena was aware of the murders involving people who criticized her on the internet. It is highly unlikely she knew since only her father Endo picked up that connection.
 * Her first name and the fact she may be a love interest could be a reference to Rena Yanase of Ultraman Tiga.
 * Rena shares her Motion Comic's voice actress with Hajime Ichinose in Gatchaman Crowds. Coincidentally, both Ultraman and Gatchaman Crowds features the main characters fighting evil in exoskeletal suit.
 * Rena is likely the ULTRAMAN counterpart to Louis Lane from Superman DC Comics, whom like her, falls in love with an alien genetically-powered superhero whose true identity is their own friend.