His full name is Amaro Aventus de Quester, known also as "friend of rotworms". His residence is Isle of Solitude.
His picture with Rotworms from 2011:
According to brazilian TibiaWiki.com.br:
Amaro de Quester is an RPG character created by Community Managers. His main characteristic is the adventurous spirit and its experience in storytelling. It is generally used by CMs to tell a story present in official articles, news or update teasers.
His age is unknown, but due to his vast knowledge of Tibia's lands it is estimated that he is between 40 and 50 years old or more.
And it is a fact, that you can see him during many update teasers, showing the Tibia community what's new.
For example here you can see him visiting Cobra Bastion:
While this picture shows him talking with Jack Springer:
Here you can see the example of Summer Update teaser, while Amaro shows Grave Danger Quest.
Usually you can't see his nick (it's hidden) on the screenshots, but you can recognize him by his outfit - always Entrepreneur Outfit in blue and red colours with warm yellow details.
The most information about him you can find on the official Tibia site here:
Here you can find an interview with Amaro himself! You can read for example that he considers Ferumbras a fashion victim, with an unhealthy obsession with his hat and something about his friendly relationship with Rotworms :D