Do all counters deal extra damage and knockback?

[sWiTcHeRoO [疾~斬]]

I'm a Shulk main, don't really use anyone else with counters, at least not that often.
I at least know Shulk's counter's damage and knockback output depends on the move that attacked him during the countering stance, where the strongest attack could mean a OHKO even if they're at low % (like if he countered Ganondorf's moves with high launching power).

Does anyone know if the other counters work like this too? I feel it's easiest to notice with him, and I don't really have much interest in the other characters with a counter to really find out on my own.

 

[tm730]

ike's marth's and lucina's work like that....they depend on the attack...ike's and lucina's can kill reliably if they counter a strong smash attack


little mac's, greninja's and peach's have set damage i believe


idk about Palutena's

Lucario's scales with aura only..it might not hit sometimes but it can kill at relatively low percentages (like 90%) if he has taken around a similar amount of damage or higher