The first, and the easiest, I think, is the new bonuses for Elemental Navis.
That's right, there's now another perk to choosing an Elemental Navi (Fire, Aqua, Elec, Wood). Along with the ability to do 2x damage to certain opponents with their Charged and Special Attacks, they get bonuses for using Chips that are the same type as them.
The bonuses:
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Base: +5 to same element.
L05: +05 to same element. +05 additional to same element if attack only hits one opponent.
L10: +10 to same element. +05 additional to same element if attack only hits one opponent.
L15: +10 to same element. +10 additional to same element if attack only hits one opponent.
L20: +15 to same element. +10 additional to same element if attack only hits one opponent.
The first number applies to ALL chips, multi-hitters included. The 2nd number applies if the chip only launches ONE attack.
So taking Aqua as the example:
At the beginning, AquaNeedle1 (3 x 20 Aqua damage normally), would get +5 Aqua damage to each of the 3 hits, for a +15 Aqua bonus overall. (60 => 75 damage)
A Wideshot would only get a +5 damage boost. (80 => 85 damage).
Simple enough, right?