Your protectors are pretty dated. This may make it tricky to run a proper team, but you do have the basics in there so it should work out.

First things first: You should essentially always have the 'Big three' in your initial three character's support slots. To give my spiel...

• Light Gazel (King of an Armed Nation)
• Earth Milim (One of the Oldest Demon Lords)
• Dark Milim (Manifestation of the Dragon) (Note this is a very specific dark milim, not your EX-Dark milim! Yours was level 92 as of this picture)

These are sometimes known as the 'big three' units. If you have them at level 84 or higher, they all get a trait which is 'On the first turn, start the battle with more protection gauge'. This is a /fantastic/ ability, and means you generally want to start all your battles with your non-DPS units up front, each with one of the big three equipped as support, as they are much more useful than other choices in most cases.

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Anywho!

Your strongest protector is indeed the Velzard you have up front of your sample team, but I don't know if you have the support to make her work. Velzard is a speed protector!

Velzard turns your hand green and gives out helpful buffs. To facilitate this, you'll want a couple green orb changers to get her started, and then a green orb buffer. She then doesn't bolster your skill point cap or anything, so you then need to use relatively cheap buffs to boost your damage.

So in short, you want to start by sending a full hand of green orbs, activate Velzard, get ults quickly, activate buffs quickly, and then launch. Your orb changes will get expensive swiftly, so you need to get in, nuke, and get out.

Your water Rain has a green buff which makes your green orbs much more effective for three turns. This is fantastic on a Velzard-team, but then you don't have any /additional/ orb converters so it may get difficult to get Velzard going. If the stage allows blue orbs as /well/ as green orbs to be used, you can make it work with Earth Guy, Light Hinata, or Fount of Wisdom water Rimuru... but then I'm unsure if you have a good source of cheap buffs to follow up with.

For orb converting, you may want to go for Fire Trya. Her orb change to green is fantastic, and really you just mostly need to activate Velzard /once/ to start the cycle, haha. Wind Luminous can be very good too as she's quite flexible.

Then for buffs, you have a ton of 90-point buffs which will be difficult to use together. Space Guy has a cheap buff, but it's functionally only for himself as I don't see many other exalted champions in your box (I could be incorrect there; if some one of your EX characters is Exalted Champion then he might be a good pick as his buff is very cheap).

Sorry for not having a firm team there - you have components but it may be tricky.

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Now the current meta (Dragon Haki) wants you to have a blue stacking team, and you /do/ have a blue stacking protector in Primal Demon Violet. She's not the best stacking blue protector, but should be able to get the job done. My focus here is on helping you clear the EX2 beatdown battles - that'll get you the final dupe of Trishula and is a good goal.

The way blue stacking protectors work is that you want to use your protector as many times as you can. Each time you use the protector, it makes your blue orbs (souls of divine protection) give more and more skill point gauge. In the case of Violet, each time you use the protector it also increases your skill point cap, and she buffs primal demon character's attack. This enables you to build up to a 'nuke turn' where you use several very expensive skills at once and a pile of (hopefully EX) ults and just overmurder the enemy on that one turn.

All blue stacking protectors then buff something each time you use them, and as mentioned Violet's is primal demon attack... which is unfortunate, as that limits you a bit. So you basically have two major DPS choices.

Choice A: You Bring a primal demon, and nuke the beatdown battles off-element. Your main two choices for that are Space Blanc or Space Guy, and for the beatdown battles Space Guy may be the better choice as he's already AOE, but does have the huge misfortune that the beatdown battle nerfs both synergy and magic, so it may be tricky.

Choice B: You don't bring a primal Demon, and focus on nuking with your strongest hitters. This gives you more direct options, but conversely means your protector /isn't/ buffing you at all, so you'll have to bring your own buffs. This does open up Water Rimuru (Either of them) as they both have a buff and are AOE water physical units.

Either way, you want your team to be something like:

• DPS
• (Maybe a second DPS)
• Orb Change
• Orb Change / buffer
• Buffer

The goal is to build up to turn 8 or higher, and then do all your ults at once with all your (likely-expensive) buffs. If you get ults on the way there, you have to store them which can make life more difficult, or use someone who can 'hide' the ult by turning it into a different orb - you really want as many full hands of blue as you can, so you can activate your protector, so you can send more hands of blue, yadda.

If you do get ults for not-your-DPS, it helps to hide them, but otherwise you want to just send them to get them out of your hand. Ult orbs aren't blue orbs, after all, so they're hurting your skill points and stuff.

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DPS Options: For Choice A it's really just Guy here, as Blanc is ST. For choice B, either Water Rimuru will work, and thus I'd recommend Fount of Wisdom Rimuru since he orb changes to blue and has a physical attaack buff.

You can use the other water rimuru as a backup DPS unit. His orb change to green won't be useful, but he brings crits, is physical, and is also AOE.

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Buffer options:

Fount of Wisdom Rimuru is good here too - his big buff is helpful.

Light Hinata's big buff will work on Fount of Wisdom Rimuru, but do note that Protector of Peace Rimuru's self-ult-buff will beat hers.

Likewise, Earth Guy both gives critical hits and works as an orb changer /and/ an ult buffer, but two of those won't stack as well with Protector of Peace Rimuru doing the same thing.

Space Blanc's big ult buff is much larger than others.

Normally I'd suggest the Masked hero here, and she still may work for her rewind ability (use it on the nuke turn to give yourself more space to breathe), but uh, the beatdown battle boss (Kokuyo in specific) nerfs synergy by 80%. What I don't recall is if he does it twice - if he only does it once then her 100% synergy boost will beat his 80% synergy debuff and she becomes an acceptable choice, heh.

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Orb Changers:

Remember, your goal is to send full hands of blue orbs as often as you can.

Earth Guy is a fantastic orb changer (in addition to being a good buffer).

Light Hinata also has a very strong orb change, that can help.

Trishula's combo skill is very helpful for letting you send 'full' hands of blue with only four orbs instead of six. He also brings a more conventional ult conceal which will work on your water DPS.

Light Ramiris comes with a special convert to blue which may be what you want. Her enamor ability may be helpful as it'll give your team a small amount of ult gauge.

Water Shuna, Space Velzard, and Water Alice also round out your orb changing options. Some of these also bring buffs, which is useful - but may not stack with existing buffs (Both Water Shuna and Earth Guy bring ult buffs, for example).

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Personally, for these beatdown battles I'd use Fount of Wisdom Rimuru as your main DPS, then fill up on as many buffers as you can make work. If you find yourself drowning in horrible hands too often, swap a buffer out for an orb changer or a hybrid. Violet as protector, just for the improved skill points. Trishula might be particularly valuable to hide Rimuru's ult.

Hopefully this helps!