J-Trinity (Momo, Sana and Mina) is the friendship between the Japanese trio. The J in J-Trinity is the short form for Japanese, therefore J-Trinity means the Japanese trinity.
- Before debuting as Twice, Sana was supposed to debut in a 6 members group 6mix with Nayeon, Jeongyeon, Jihyo and Minyoung (SIXTEEN) replacing Cecillia who left the group. However, the plan was cancelled due to Lena's departure.
- Mina and Momo were part of the Japan team of JYP trainees.
- They are each from different cities in Japan: Sana from Osaka, Momo from Kyoto and Mina from Kobe.
- When they were trainees, they wished that all 3 of them can debut in the same group, and that wish has fulfilled by debuting with Twice.
| To view the J-Trinity gallery, click here.