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[eluser]vadivelan[/eluser]
Second approach is to use a hook.
1. Create a pre-controller hook
2. From that hook access the total number of segments ( using uri library ).
3. If total segment is one, collect the uri_path (using uri's uri_string )
4. Check if this related to any real path using file's set_realpath. If this doesn't resolve to valid path then you shall verify and generate your user profile or redirect to their profile page.

if( $this->uri->total_rsegments() == 1 ) {
$uristring = $this->uri->uri_string();
if( ! $this->file->set_realpath('./system/application/'.$uristring . ".php" ) {
echo(" got it");
}
}

But like my above post, I don't know how to access CI's libraries within hook. lol.