A Roaming Guard

I know adding guards has probably been suggested a ton but I still feel like it’s something the game has seriously been missing so here me out. Personally I like to build a lot so I’ll have walls or castles all built up everywhere but they feel empty and unprotected yeah we got iron golems which are extremely effective but they can’t fit or really have a use on a wall or inside buildings and a snow golem honestly causes a mess if you place them and if they go out into the sunlight they die, there not the best. So what I was thinking was adding some kinda mob it doesn’t have to look like a player or villager it could even be a new variant of a copper golem. If it would be a new mob that isn’t a golem you can throw armor on it like leather armor nothing more than maybe chainmail at most iron or even its own kind of armor like dogs and you can dye it. They have the option to have stone or iron swords maybe shields Im not sure though shields could make them pretty good or a bow with no enchainments with a small inventory for arrows. They could be built or have a job block. The idea is they function like a iron golem with more customization, more maneuverable (fit in 2 block gaps) and weaker than a iron golem they can’t run around with you like a dog or cat but roam around your base instead. The games great that’s why I’m suggesting a “new” idea so if you do see this don't see it as hate I just truly believe this could be a good fit in areas where the game is missing.