This was the first submission to AGNPH's contest. Accompanied by another segment of their description (chopped for length):

Tanner and Lexi are biological twins, born without the air sac around their necks to assist them in their aquatic endeavors. Though they can often be seen without, they sometimes wear things around their necks such as bandanas, scarves, and collars to try and fit in with other buizels. Fiercely loving and protective of each other, the siblings are never far apart and thrive on physical contact with each other. Friendly and playful, the twins are always up for a little fun and games, whether innocent or not. Though mostly sociable and outgoing, the two can still be a little shy with an audience in certain situations.

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Props to  otterface