Seems related to this:
I think there should be 4 items for each character that are only visible for them. These items would each be for a specific ability of theirs. Using Abram's and Bebop's abilities as examples you could have items like
Abrams
Siphoning Aura
costs 500
Spirit
Ability range +8%
Makes Siphon Life have 360 degrees of range.
Nimble Giant
Costs 1250
Vitality
Bonus Health +100
Allows you to jump and use stamina when charging to double jump. Turn rate slightly increased.
Infernal Aggression
Costs 1250
Weapon
Firerate +5%
Weapon damage...
But 2 is an odd number. One for each ability is how I envisioned it previously.