The Mermaids are recurring characters from the Disney Channel series Phineas and Ferb, they come in light-tailed, lighter-tailed and dark-tailed and they heavily resemble Isabella and the Fireside Girls but as teenagers.
Disney Wiki
The Mermaids are recurring characters from the Disney Channel series Phineas and Ferb, they come in light-tailed, lighter-tailed and dark-tailed and they heavily resemble Isabella and the Fireside Girls but as teenagers.