I have a setting based on... Japan. Yeah, let's just say Japan as a whole at this point, because fuck it.
Strike Witches/that Japan-Only anthropomorphic naval game/history.
You're a soldier fighting in a World War. The theory is that Rome never collapsed, the Middle Ages never happened, and technology is years ahead of events. England is lead by a church and a crown, is against America, defectors and rebels, Germany, Italy, and other nearby countries have been oppressed by England for land rights and have begun to fight back, though they also dislike America for their ties to America:
Team 1:
England, Russia, and China, a few other European countries
Team 2:
America, South America, Oceania, Australia
Team 3:
Germany, Italy, France, Spain, other European countries
Soldiers are myriad in abilities. Mechanical abilities and magic ones coexist- magic is not quite as powerful as most mechanical applications and a bullet will kill anything, but there are some adept in old skills.
Every soldier wears an ARMAS, an Advanced Reactive Mobile Armor System. This varies depends on the type of soldier:
Light/Mage: Fast and light, but mostly unarmored. They aren't able to do anything extraordinary, except for the fact they can move fairly fast. This is the suit most, if not all, magic-proficient users wear.
Marksman: This is a fairly advanced suit, useful in all situations but none more so than stationary firing. The arms can be stabilized for very high accuracy, and the leg armor can provide cover, a place to set a bipod, or other things.
Heavy: A modified Marksman suit that changes the arms for a variant to increase strength. The legs still allow for instant cover.
Scout: Lightweight armor designed around the Mage build, but capable of great jumps, climbing ability, and running speed.
I feel like I need more classes. Maybe. I might break it down to individual choice of legs, body, and arms.
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Then, there's magic. Not everyone can use it, this is done during character generation with a d8. On a result of 1-6, you are mundane and cannot use magic, on a 7, you are able to learn a single spell, and an 8 allows you a whopping 2 spells.
Spells vary based on type: you have various elemental attacks that are mostly the same, Light and Dark which don't actively attack and are closer to a summoning skill, and Healing.
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Weapons are simple-ish, and grow over time.
You get three weapons total: an integrated weapon for your ARMAS, often something powerful with little ammo, such as a micromissile launcher. There are then Main Weapons, which at first are very simple, bolt-action, five-round rifles. Eventually, as the fight progresses, you'll come close to rifles similar to today's weapons.
Lastly, you get a sidearm. At the start, this is either a small arm such as a pistol or a melee implement better than the common knife. These can also be medkits, grenades, or other items.