@Wetrix
The most important thing to know is that they require quite some care: they need an UV lamp and a basking lamp\spot
Aquatic turtles need a powerful philter to clean their waste _and_ a partial change of water from time to time.

As pets, they are different. Some like to cuddle and sleep on their mamas, others may bite and pee :)
But they all surely like scratching
https://www.youtube.com/watch?v=x8XKN9QoVrY
Ours also love doing crazy stuff in the water, jumping from her basking spot, etc.