Yes, Ant Man is indeed an Avenger in the comics. He's been part of the team on multiple occasions and has played important roles in various storylines.
Luis is Scott Lang's friend. He's really funny. He has a habit of getting carried away when he tells stories, going into long - winded and overly - detailed accounts. In Ant - Man 2, he continues to be involved in Scott's adventures. He helps Scott out in various situations, using his own unique charm and street - smart ways.
Well, Ant Man's strength in the comics varies depending on the situation. He has the ability to shrink to microscopic sizes while retaining his normal strength, giving him an advantage in certain scenarios. Plus, his communication and control over ants can be a strategic asset.