I've concentrated on the characters.pl script. This may or may not help, but I'm not getting the errors that I was getting when I first ran it:

#!/usr/bin/perl

use strict;
use warnings;
use diagnostics;

foreach my $name (keys my %characters) {
    my $id = $name;
    $id =~ s/ /_/g;
    $id =~ s/[^-\w:.]//g; 
  
    my $experience = $characters{$name}{'experience'};
    my(@classes) = @{$characters{$name}{'classes'};};
  
    print qq[<h1 id="$id">$name</h1>\n];
    print "\t<p>" . print_classes($experience, @classes) . "</p>\n";
    print "\t<p>Experience: $experience</p>\n";
}
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