sometimes I make up games as a means of falling asleep; it wasn't too effective last night
So my big gaming love is tactics games. But also, I love the big innovation Ōld World brought to the strategy game - the orders system. I.e., you get a number of orders per turn and you spend those to move units, issue decrees, appoint officials etc. etc. etc.
Now, what if we combine the two things? I'm envisioning a small-scale turnbased tactics game where you are playing a squad leader in the style of Tactics Ogre, BUT! on your turn you can always move and act with your player character and you can command 2-3 other characters with detail – move here, attack that target. Everyone else does the simplest fallback things. Melee troops attack whoever's in melee range, archers make the surest shot available to them, supports heal the most wounded and maybe step out of melee contact.
So it becomes a game where you have to decide where you can post someone up such that you can just leave them to their own choices, when to leave someone in danger, just so you can focus fire on a high value target.
And maybe there's a separate advancement tree for you command abilities. You could unlock things like giving a collective move order to a group at once. Or a battle language that lets you issue more orders in the same time frame.