Exactly. We can't simply tell you what you should think of.
True. But I can tell you that this looks very much like spam to me. If you don't have anything of your own to add to the topic then don't post.
I can.
I'd like to see a journey that explores the emotional side of the protangist and show the mental challeges he faces.
As Lusankya pointed out, this is not really a matter of plot but rather what the RPers make of it. Even an RP with an action-oriented plot can have a lot of emotional and mental exploration if the RPer in question emphasizes these aspects in their writing. (I always draw on the whole emotion and backstory bit, a lot, even in RPs where the RP master is more focused on the action) Conversely, flat and emotionless posts can spring up anywhere. At the end of the day, the plot itself is largely a moot point for this sort of thing.
Anyway...yeah, if you don't have any ideas of your own then you shouldn't really start an RP either. Not only does running a successful RP take a lot of time and commitment, it also requires plenty of creative work on the thread creator's part. A good base idea means nothing whatsoever if you don't manage to develop it in an interesting way as the RP progresses, and if you can't even manage the basic idea on your own then I seriously doubt that you'll be able to keep it fresh either. (Take it from me: keeping that plot going is a
lot harder than getting it started) Plus, if it's not your idea to begin with - and if thinking such ideas up is really so hard - then the RP is going to get really tedious and frustrating for you really fast, which means you'll probably abandon it in a matter of weeks. :\
So yeah, if you have an idea, I'm quite willing to comment and help you expand on it, but don't expect anyone to do your work
for you. If you want a good RP then all I can suggest is that you go out and search for inspiration (it could be literature, it could be games, it could be TV, it could be life; whatever works best for you) and stick to just joining RPs until you have a clear idea of what you want to do. ^^