So pretty much shields would have abilities that you can use.
They would replace shield bash, but take more damahe from your shield.
Eg. Swifstrike buckler
Asi med boost but takes all health from your shield.
Volcanic Plate shield
Fire resist and your shield goes down twice as fast but people who hit your shield take damage.
Snarby shield(don't know the name)
You slam your shield down and spikes travel down a straight path.
This takes out your shield. Previous lines have the same thing too.
Owlite shields
Your shield weakens but when it breakes it makes an explosion that does the status that it was destryoed with. If there is no status then it does normal damage.
Heater shield
Your shield explodes and deals strong fire to enemies nearby. However this can hurt you too.
Ironmight plate shield(and all shields below it besides 2 star)
Your shield deflects all projectiles and damage for 1 hit( for 3-4*) and 2 hits(for 5*) and you can move around.
HOWEVER your shield breaks and you are slowed down.
Skelly shield
Same exact thing for owlite but looks purple
Jelly shield
Your shield takes half damage but you are able to shield bump further, shield bumping does damage and you can shield through spikes without taking damage or flinching. This lasts 2-5 sec (depending on heat level)

Ok these are my ideas.
Tell me any shields I missed
Also tell me if the setbacks are good enough
And feel free to exploit any flaws and please tell me them.
Also tell me any ideas for shields.