>>530892498
Justia's best costume for PVP is Blood Glutton; Otherwise her summer costume is the next best mostly because the dodge helps her survive lots of damage. As one anon said, she'll needs attack boosts so Lathel or Liberta are both solid choices; crit rate and damage do nothing for her
For defence you want a 'wall' type character i.e. someone that can build either 90 magic res and/or defence. Grandhildr's idol costume is great since she forces teams to build to counter her taunt thus usually protecting your team. Other good preemptive costumes are Morphea's and Lathel's. Glacia's Alice skin is very strong with a self-revive and reapplying taunt, and her school costume both helps her tank magic and does lots of magic damage. 90/90 on her is actually decently realistic too though it's expensive. Seir requires lots of setup which is hard to get in PVP and is vulnerable to Justia's element but is hard to take down otherwise when set up. Lecliss' entire kit is probably best, because barring dispels she's almost guaranteed to one-shot low defence/hp characters
Fun mentions; Teresse's Angel of Destruction and Summer skins have some use, since her bleed can often hit very hard, is 1SP at +3, and can easily kill with the knockback. It's also very difficult to get high chains in PVP so do anti chains. She also just has a lot of HP which comes in handy
Olstein removes buffs while also having a huge offence debuff in a 3x3 range thus almost ensuring your team lives, as well as an SP draining silence though he NEEDS dupes to be cheap on SP and isn't durable without lots of rerolls on gear
Eclipse and Venaka are both very strong on defence and offence, and speaking of offence, Eleanor's base costume and all of Schera's are important for dispelling taunts and barriers/energy shields
I hope you enjoy this wall of text as much as I enjoyed writing it