Adult Mode: It's a little crazy but it's separate from normal quick play so it wouldn't get in the way. An "adults" mode where instead of six kids there are like three adults, maybe the classes could be Nicky Roth, Beatrix, and Quentin. So They would be stronger and faster but there's less of them. The Neighbor would also be buffed with more health and damage output, and I think he'd still be able to outclass a group of three. The catching system would have to work differently so here is my idea for that. catching would be more like combat, with attacking offensively being very loud and intense. But The Neighbor would be able to stealth attack unaware players, with the kill animation taking longer but being very quiet.
Chaos mode: Again this would be separate from quick-play as it's a bit more fun and light-hearted than the sometimes competitive quickplay matches. My proposal is 12 kids, 12 locks, and 2 Neighbors. There really isn't much to say about this one since.
Please keep in mind that these are standalone modes from quick-play like brawl, so if you're a pub sweatlord don't come at me.
If you have any other ideas leave them in the comments and I might add them to the post!