Systems and methods for operating a messaging system are provided. An example method includes receiving an authorization from a user to enable use of a self-image of a further user in a personalized video, sending, in response to the authorization, the personalized video including at least part of the self-image of the further user and at least part of a stock video to a further computing device associated with the further user, and receiving, from the further computing device, an indication of whether the further user has authorized using the self-image in the personalized video. The method includes receiving a text typed by the user, synthesizing a voice reading or singing the text, and adding the voice to the personalized video. The method includes, prior to sending the personalized video, modifying a voice present in the personalized video to match the voice of the user.