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That depend of the song/PV you saw. You know, vocaloids (at least the official ones) doesn't have an specific personality or relationship. I will give you one of the songs that Gumi and Len sings:
ah wonderful nyan life(I think that's the name). That shows Gumi and Len. You can look it up on YouTube. Anyway, some songs don't show Gumi and Len. So I gave you the answer. Hope you understand. :)
What else can I help you with?
What is the number on Kaito Gakupo Gumi Haku and Neru's shoulder?
Kaito's sleeves always cover his, Gakupo, Gumi, and I think Haku aren't actually vocaloids so they have no number. Meiko is 00, Miku is 01, Rin and Len are 02, and Luka is 03.
What are gumi bears made of?
GUMI’s hair.
Is gumi released?
Gumi was released on the 25th June 2009
When was Kongō Gumi created?
Kongō Gumi was created in 578.
When did Kongō Gumi end?
Kongō Gumi ended in 2006.
When was Kumagai Gumi created?
Kumagai Gumi was created in 1898.
What is the population of Kumagai Gumi?
The population of Kumagai Gumi is 2,006.
When was Gumi College created?
Gumi College was created in 1992.
When did Abubakar Gumi die?
Abubakar Gumi died in 1992.
What is Kumagai Gumi's motto?
The motto of Kumagai Gumi is 'We build with heart'.
When was Abubakar Gumi born?
Abubakar Gumi was born in 1922-11.
Is megpoid gumi's last name?
Megpoid is Gumi's last name
