Jin

Species: Mermaid
Relationship status: taken by Namjoon

He is the oldest of BTS and the mate of Namjoon. He is sick with a illness that only mermaids can get. He is also pregnant with his and Namjoon's little girl. When he's in his human form his hair is black but in his mermaid for its pink along with his tail

His tail:

Namjoon

Species: human
Relationship status: taken by Jin

He is the 4th oldest, the main Rapper and the leader of BTS and the mate of Jin

After Jin kisses him, he will sprout a green tail that will stay with him as long as hes with Jin
who is in his form as he his hair will change to green

His tail:

Jimin

Species: Mermaid
Relationship status: taken by Yoongi

He is the 5th oldest of BTS. He is the same age as Taehyung. He is also the mate of Yoongi. When in his human form his hair is black and when he is in his mermaid form his hair is blue along with his tail

His tail

Yoongi

Species: human
Relationship status: taken by Jimin

He is the 2nd oldest and Rapper of Bts and the mate of Jimin.

After Jimin kisses him, he will sprout a aqua tail that will stay with him as long as hes with Jimin who is in his form and his hair will change the same color

His tail

Hoseok

Species: half-breed
Relationship status: Single

He is the 3rd oldest and the Rapper of bts. He is a half breed; his mother was a mermaid while his father is a human. When in his human form his hair is black and when he is in his mermaid form his hair is orange along with his tail

His tail

Taehyung

Species: human
Relationship status: taken by Jungkook

He is the 6th youngest of BTS and the same age as Jimin and the mate of Jungkook

After Jungkook kisses him, he will sprout a purple tail that will stay with him as long as hes with Jungkook who is in his form and his hair will change the same color.

His tail

Jungkook

Species: Mermaid
Relationship status: taken by Taehyung

He is the Youngest of bts and the mate of Taehyung and the lead vocalist.  When in his human form his hair is black and when he is in his mermaid form his hair is red along with his tail

His tail