Hyunjoong

Species: Mermaid
Relationship status: taken by Jungmin

the oldest and the leader of SS501 and the mate of Jungmin. When in his human form his hair will stay the color black along when he transforms but his tail is perl green

(A/N: Ignore the color for this I couldn't find one for the color I used)

His tail :

Youngsaeng

Species: Mermaid
Relationship status: taken by Kyujong

the 2nd oldest of SS501 but the oldest and the leader of ss301 and the mate of Kyujong. He is sick with a illness that only mermaids can get. He is also pregnant with his and Kyujong's little girl like Jin. When he's in his human form and mermaid form his hair is black. His tail is red.

His tail:

Kyujong

Species: Human
Relationship status: taken by Youngsaeng

He is the third oldest in ss501 but the 2nd oldest of ss301 and the mate of Youngsaeng

After youngsaeng kisses him, he will sprout a blue tail that will stay with him as long as hes with youngsaeng who is in his form.

His tail:

Jungmin

Species: Human
Relationship status: taken by Hyunjoong

He is the 4th oldest of SS501 and the mate of Hyunjoong

After Hyunjoong kisses him, he will sprout a silver tail that will stay with him as long as hes with Hyunjoong who is in his form.

His tail:

Hyungjoon

Species: half-breed
Relationship status: single

He is the youngest of ss501 and ss301. He is a half breed like Hoseok. His mom is a mermaid while his father is a human. When in his human form and his mermaid form his hair is black. His tail is also black.

His tail: