In many cases, Thor eventually regains Mjolnir. However, the circumstances and challenges he faces to do so vary greatly from one comic series to another.
Thor lost Mjolnir in the comics because of various reasons. It could be a powerful villain's curse, or a moment of doubt within Thor himself that broke the bond with the hammer. Sometimes, external circumstances beyond his control also played a role.
Yes. The breaking of Thor's hammer in the comics is part of complex and dramatic storylines. It can happen for various reasons related to the plot and character arcs.
Sure does. Sometimes it's due to powerful enemies or complex storylines. But don't worry, there's always a way for him to regain it or find a new source of power.
Sure does! Different comic arcs have presented Thor with new and powerful hammers to wield, often tied to significant plot developments and character growth.
It could be argued that Loki is also a kind of protagonist in his own way. Even though he is on the receiving end of Thor's hammer, his actions leading up to that moment are likely what drive the story. His schemes and plots are what cause Thor to react, so in a sense, he is a central figure in the narrative as well.