So what silvers are best for the last master story? Things go well until the AI gets bb3/unblockable and then I lose a character... Do I have to invest in heavy defensive moves to survive or is there an easier way?
Like i said before, Beat Box is useful thanks to his quick meter built, just be careful to spam them when the enemy is down or far from you, unless you debuff them and you get the debuff too.
Other fighter (wiki order)
Underdog: if you give the enemy a debuff when it bounce back you get armor and haste but its a risky move.
Hype Man: good thing you can drain enemy blockbuster and give 50% meter to your other fighter, bad thing you have to be in hype mode, faster way is to equip three taunts and then spam throws.
Number One: meh, he can have haste, but that's all.
Bassline: on tag in heavy regen and armor for 10 seconds, plus 35% meter.
Beat Box: 25% meter when you use a special, you can equip four and a bb3, i used two plus three blockbuster.
Understudy: armor on throw, you just survive longer.
Big Top: her resurrection can let you fight a little longer when you die, but that's all.
Toad Warrior: the only useful Cerebella thanks to her meter gain, too bad you can't use some of her special and Exellebella because they inflict debuffs.
In Denile: with Sekhmet you gain armor and immunity, but her attack is low.
Bloody Valentine: better, anytime you use a special you gain 15% hp, 15% meter when a blockbuster is used, still her attack isn't very great but every hit should take away 1% hp.
Hair Apparent: use taunt for haste, a blockbuster for 50% chances to reset special moves. You can only use Taunt, Drillationship, Hairball, Drill Tempered and Blowout (and the tag out) moves since they don't inflict debuff.
Heavy Reign: 50% when you do or receive a critical hit to gain 15% meter, risky because you lose hp but is a fast way for her bb3 that does a lot of hits, be careful because you will also inflict bleed.
Nearly Departed: can get invincibility and resurrect teammates with 25% healt, just do the math.
Necrobreaker: if you have one, on the final ht get final stand for 10 seconds, when you charge the tail you get hp.
Dead Heat: gain meter when the enemy have a blockbuster and you haven't, plus her special and blockbuster are unblockable when below 25% hp, almost like the enemy, I would say she's better than the other Squigly but she's risky to use.
Scrub: just tag out to regain 25% hp, the other fighter recover hp and meter twice faster.
Icy Hot: even better, on tag 15 seconds regen and 15% meter, that works also for your other fighter on tag.
Kill Joy: just let her day last so your other fighter resurrect with 25% hp. The other fighter can also get permanent regent when falls below 50% hp and it's at advantage, so choose light or dark for the other fighter.
Painwheel is a big no since she inflict too much debuff, Double, Filia and Peacock too, Ms Fortune only Hellcat or Just Kitten but you have to avoid debuff moves so you can't play as usual, the other fighter variants that i haven't put on the list aren't good for that node (at least for me they aren't).
I would say Icy Hot with Forbidden procedure and Trauma Center as the second fighter, for the first both Beat Box or Bloody Valentine, Heavy Reign if you have moves with high critic rate and/or her first marquee and you don't mind bleed.
came across this one fight that I made a 100% bleed resist bigband (with the help of PD’s SA ofc)
I’m just spamming on my own post now. 
Here’s the stats btw.
