Bedrockgames
Legend
One is the Character Funnel from Dungeon Crawl Classics. Everybody rolls up four level zero characters and plays them all. Just random rolls for ability scores and no class features. Whatever survives gets to be level one. That might not work well for actual 5e, but it is a fun idea.
I've been in a dungeon crawl classics campaign that did that and it is so much fun.