Creating a Voki and embedding it

Well today I had a go at creating a Voki as a trial science lesson beginning to engage students,  but I think the voice sounds rather flat and there is no pause.  I think perhaps the more expensive versions of characters are probably better.  I preferred the 3D versions which I think would be a lot more engaging with students.  I should try that instead.    As well I could only place a certain amount of speech, it won't let me place any more than that.

The link to create a Voki is:  Voki Link