[Snake]

Inaptitude
(Requires Base APT at 0)
- You're not really fit for combat at all, but you have a strong belief that you can be as good as one even with no fitness at all. This trait reduces your Skill Slots to 4, and negates Skill Slot bonuses granted by SKI/WIL/GUI. (Those are treated as 'One-Trick Pony' abilities while this trait is equipped. When equipped, this trait will also remove all of your skills equipped. 'One-Trick Pony' abilities have their FP cost reduced by 25%)

Simple Tactics
(Requires Inaptitude)
- Unlike other combatants, you're obviously not versatile with what you do, but you're pretty well-used to doing one or three things. This further reduces the FP cost of all 'One-Trick Pony' skills/spells by an extra 25%, but reduces your Skill Slots to 3. (When equipped, it will remove all of your skills equipped.)

Skill Addiction
(Requires Inaptitude, Simple Tactics)
- Your lack of versatility is slowly devolving into some sort of fanaticism by now, to the point of becoming a sworn oath that you will do nothing but use it in combat. Once you use any One-Trick Pony skills over 10000 times in combat, this Trait will grant a passive bonus of +3 to all of their Rank LV. (Finishing combat without this Trait will RESET your progress to 0.)

Art of Choptaro
(Requires Inaptitude, Simple Tactics and LV10000+ Skill Addiction)
- You've became nothing but a maniac who can only use one skill in combat, following the legendary martial art of Choptaro. Increases the 'One-Trick Pony' skill's Range by 3 (if base Range > 1), Hit and Critical by 50 and Rank LV by an extra 3. Furthermore, any cooldowns that would apply to those skills will be removed. (It will not affect skills that 'can only be used once per round'.)

[Lolzytripd]

I think a key point is that passives shouldn't have a skill slot cost with inaptitude. Some classes make you just slot a ton of passives.