i suggest some kind of ginormous one-man fighter, which is the logical alternative to one man caps as it is actually designed to be manned by a single player.
EDIT: op edited for more "realism"
This obviously needs balancing, but general Ship characteristics:
-Same size as large transports/cruisers/liners/bs depending on design, with the forward facing hitbox of a BS
-But looks like a fighter, with one cockpit and a crew capacity of one or two people.
-Very High speed, maybe cruiser maneuverability.
-Forward firing guns/turrets only, not designed for ts/tz, and designed to take out nothing more than a gunboat/cruiser depending on design
-Also an explosive kamikaze forward firing weapon (essentially self destruct) with very high damage, requires 1 expensive $10 mil ammo (and is limited to one ammo only), drains so much core to the extent that it has to shut down its shield before firing, and that only has a range of 100Meters (which would most certainly kill the firing ship within its blast radius)
-Has support for light cloak, has a HF cargo hold
-HF hull and trans bot count, max. bs shields
-As expensive as a CAU8 BS
RP context: A faction designs a ship with a focus on speed and survivability, as it is running out of members and the remaining are becoming increasingly valuable which it cannot afford to lose, therefore the standard cap ship design has become impractical for it as it hasnt the manpower to man a cap ship. The ship is designed to outrun everyone, outgun light ships, and at least try to take out a cruiser with it if it somehow must die. A favorite amongst the richest of individuals, it is also the ship of choice for open confrontation between elite pilots because factions need their best pilots alive. And only the best pilots can pilot this ship as it requires a very high tolerance for the G-force produced by its acceleration. It has little hull and no agility.
The concept of the ship centers on individuals, with its emphasis on speed and agility achieved by making the ship one giant cluster of power cores, thrusters and propulsion. Since its propulsion systems consumes a great amount of power in order to achieve a faster-than-LF-speed, what little residual power core is only adequate for the sustained firing of a number (8-10 perhaps) of maybe gunboat turrets or its suicide meelee attack. It is not designed to survive direct confrontation with Capital ships. Since the ship is more than 80% power core, it becomes extremely vulnerable and volatile once stripped of its shields, after all its armor has also been stripped to give it maximum agility. Inrply the ship has the core of several battleships combined, but the "residual" core is only that of enough to power its gb turrets.
tl;dr Cap ship sized fighter
No atmosphere? GTFO.
The propeller is the greatest invention of all time.
