Multiple BTS members have sported blue hair at various times. According to the provided reference, RM, also known as "Blue Joon" when he has blue hair, has had blue hair several times since the group's debut. Additionally, Jimin, Suga, and V have also experimented with the color blue.
Here's a breakdown:
| BTS Member | Has Had Blue Hair? |
|---|---|
| RM (Namjoon) | Yes |
| Jimin | Yes |
| Suga | Yes |
| V | Yes |
Therefore, based on the information available, more than one BTS member, including RM, Jimin, Suga, and V, has had blue hair.
