How Roxas, and more recently Ari, tend to communicate. The famous '...' or ellipsis. People such as Axel and Demyx have learnt to read into the deeper meaning of the dots.

Also, Naminé is often reduced to dotting by the sheer volume of crazy around her.

Jack Spicer will dot from time to time, but the dotting is often followed by an insult or 'whatever.'

Link (The Howling One) often dots as a way of communicating.

Garrett often dots for want of anything to say.

Kratos often dots through sheer lack of social skills.

Jack Sparrow has every intention to stop the dotting because he finds it annoying that he cannot be eccentric with dots.

Vivi dots mid sentence because a full quarter of his dialogue in game is dots, and the mun must meet the quota.

Shadow the Hedgehog dots for reasons similar to Kratos and Garret, that and the fact he's a jerk.