(2017-03-13) Kaga Kaede (Morning Musume。13th generation) : "I feel a lot of jealousy towards Yokoyama as well. We both have good singing and dancing skills, but Yokoyama has better expressing abilities. I didn't realize it until I knew her, but it's true that this is an important point. She makes me want to surpass myself even more."
(2017-11-17) Nonaka Miki (Morning Musume。12th generation) : "Yokoyan, I thought people liked her because she was cute with her smile, but it turns out she has innate courage."
(2018-01-06) Iikubo Haruna (Morning Musume。OG, 10th generation) : "Reina's voice and laughter are similar to Suzuki Kanon's."
(2018-05-31) Shimizu Saki (ex-Berryz Kobo captain, staff member) : "When I take a better look at Yokoyama Reina, I find her dance and figure to be very similar to Tsugunaga Momoko."
(2018-08-18) Michishige Sayumi (Morning Musume。OG, 6th generation) : "About Morning Musume。'18... I went to see their last concert at the Nippon Budokan and Yokoyama Reina-chan really impressed me with her smile, of course... But also by her dancing which was really incredible. Yes... I didn't really take my eyes off her, she was so cute."
(2018-12-22) Morito Chisaki (Morning Musume。14th generation) : "I love Reina for all she's and what she represents. I want her to stay by my side forever!"
(2019-07-03) Kamikokuryo Moe (ANGERME) : "Yokoyama-chan is someone who's a perfectionist, she always works hard. I think talking to people like her is really great. An atmosphere of trust is immediately installed, I can speak with her without worrying about my words, I love it."
(2019-12-30) Kitagawa Rio (Morning Musume。15th generation) : "As soon as I joined the group, Yokoyama-san came to see me regularly, she was very kind and helped me with everything. If she hadn't been there, I would have been frustrated at times."
(2019-12-30) Yamazaki Mei (Morning Musume。15th generation) : "Yokoyama-san smiles all the time and helps us a lot during the lessons of the 15th generation. I think it's a senpai as bright as the sun..."
(2020-12-12) Ishida Ayumi (Morning Musume。10th generation) : "The debut tour of 13th generation members was a concert tour called THE INSPIRATION. At the time, I already thought a lot that; it looks like it wasn't their debut tour at all... I remember, there were those 3 shuffle songs, performed by 13th generation alongside their senpai and the intro only by two of them, I like this tour so much! And during KOKORO&KARADA tour, 13th and 14th generation members sung "Rock no Teigi"... I remember how this performance shows the coolness of our youngest members! It was particularly impressive. Even when they finished, I was frozen like "It's really 13ki~!"."
(2021-02-05) Okamura Homare (Morning Musume。15th generation) : "Yokoyama senpai isn't the senpai with whom I have spoken so much. Maybe she scared me at first. But, Yokoyama-san helped me so many times. Everyone from the 15th generation think the same way. For so many things..."
(2021-04-05) Fukumura Mizuki (Morning Musume。9th generation, leader) : "She changed a lot the moment the 15th generation joined us and I love it. According to her own words, Yokoyan is starting to feel a little better, thanks to having kohai which somehow "completed" her. I feel like Yokoyan is more an older sister than a "senpai" for them (lol). The small Yokoyan, who's looking towards the future followed by the 15th generation members walking just behind her, is insanely softened."
(2021-04-05) Fukumura Mizuki (Morning Musume。9th generation, leader) : "She changed a lot the moment the 15th generation joined us and I love it. According to her own words, Yokoyan is starting to feel a little better, thanks to having kohai which somehow "completed" her. I feel like Yokoyan is more an older sister than a "senpai" for them (lol). The small Yokoyan, who's looking towards the future followed by the 15th generation members walking just behind her, is insanely softened."