Vanilla? Madder AKA VMD or VMD Sim is a Deus Ex vanilla conversion focused heavily on RPG and roleplay elements, immersive sim gameplay, modernization/QOL, and more. Skill trees, hunger/stress/smell systems, in depth character customization, status effects from foods, and so much more are included. It also boasts the ability to run with almost any mod, and, in the future, will be able to be used as a near-universal starting point for any total conversion. Note: While not beta or demo, the project is in phase 1 of development. The project will reach its ultimate form at phase 4. Even at this relatively early point in its life, it is ready for quite a few hours of gameplay and boasts many fun features. Arguably, it is very much worth at least one try. Or not. You're allowed to dislike it, too.
Meet the Modular Electronic General-Use Helidrone, or MEGH. MEGH is a semi-customizable sidekick the player can build, should they have sufficient hardware skill and talent point investments. It won't be cheap, and it needs maintaining and controlling via the drone order context menu, but it's fun, it adds soul, and it makes JC a little less lonely as a covert operative. I would argue "fun" is the best metric for adding something meaningful to the game.
In these last 2 screenshots, MEGH is demonstrating a side-grade you can acquire from "ritegel" medical gel. With it, MEGH can heal people you want to protect, including yourself, acting as a miniature, makeshift healing bot for those in need.