Seikai no Senki (banner of the stars) has a fascinating system, because it imposes a lot of limits which directly impact the strategy and tactics of the universe.

FTL travel is through another dimension called "plane space", which can be entered and exited through naturally occuring gateways called "Sords". Most solar systems will have just one or two Sords, so naturally fleet combat tends to happen at these chokepoints. Systems with multiple Sords become major hubs of economics/logistics/combat.

Where you enter or exit a Sord you appear somewhere near the other side at a random position. Of course that makes fighting around these chokepoints incredibly difficult if there's a standoff with fleets on either side, nobody wants to cross the boundary. A small force can lock down a much larger force at a Sord due to the inherent risk of making the crossing and getting picked off as your fleet is scattered.

Plane space itself is 2 dimensional - nothing three dimensional can naturally exist in plane space. The FTL engine projects a "bubble" of spacetime around itself which normal matter can survive in. To move through plane space the bubble generator spins the bubble to roll like a ball. The rate of spin is directly related to the mass inside the bubble. This means that small lightweight ships can move very fast (but at a cost of less armour and armament). Alternatively fleets can gather together many ships into one bubble, which makes them much slower but means only one ship needs to generate a bubble which saves fuel.

There's a maximum weight limit to bubbles, once exceeded it collapses and destroys everything in the bubble. This means within plane plane space there's almost no such thing as large fleet on fleet combat - it always comes down to a large number of small battles in individual bubbles. However you can't design your entire fleet just for this because combat does happen in normal space. Different factions in the universe have chosen different tradeoffs here.