Usability
Interface 
User-friendliness/complexity of the tool´s interface
Intuitive.
Time efficiency Time needed for mastering the „how-to“ of the tool and a production of a task
Medium.
Interface language(s) The number of languages in which the tool is currently available/adaptable to
Several languages.
Respect for privacy Does the tool require registration? Who can see my data? Can I remain anonymous?
Medium. Toontastic was developed by Google, which is well known for using user data for advertising and marketing purposes. However, it does offer a high degree of data security. Despite being designed mainly for children, there is no specific privacy policy for Toontastic, so users should refer to Google’s general one. It abides by the GDPR and acknowledges users’ right to be forgotten. See more here (Google's privacy policy).
Saving work for future use Possiblity to save your or others´ work for reuse/reproduction
Yes, users can edit and save their creations for later use on ToonTastic.
Tailorability (If so, how?) Possibility of the tool to be used for a range of different activities (e.g. to what extent you can organize a project assignment with a central activity based on this tool)