hopefully this question isn't very confusing 
#What's the most damage your showcased characters (all of them) have done?
digital helm
ive done 200k with hu tao, 100k with bennett, and 92-98k with heizou 
(i cant remember anyone else 
)
fiery basin
439k hu tao and 393k mona are my best two so far
upper loom
309k with Bennett hes the only one ive showcased
rustic siren
429k with childe, 59k with xiao, idk about xiangling, like 36k with ayaka, 120k with bennett, and idk about shenhe
chrome hill
179k with raiden
blazing isle
50k with Heizou
I don't have anyone else showcased
On my challenge acc
Noelle - 11k (Suprisingly) Lumine 3k and Barbara- ahem 423.
The account is AR 25
lusty gyro
58k with xiao (Faruzan pls come home)
and 30k on dps mona
frosty vessel
uhh so heres the list of all the characters ive tested
some values are a bit off
1.1M with eula c0r1
700k mona c1
299+340k XQ c6
190k x 4 chongyun c6
300k + (3 x 330k) yae c0
674k raiden c0
160k kokomi c1r1
102k faruzan c0 (lvl 50)
400k heizou c4
300k xinyan c5
620k yelan c0
320k ayaka c0
160k lisa c1
220k ganyu c0
110k xiao c0
102k geo trav c6
230k diluc c2
112k kazuha c0
30k cyno 💀 c0
20k ayato 💀 c0
120k qiqi c1
103k jean c1
120k per burst tick xiangling c6
200k bennet c4
430k sara c6
314k beidou c4
90k ningguang c6
fishcl .. i forgot but its like near 200k c6
80k sucrose c6
90k rosaria c2
40k layla c2
50k noelle c6
160k thoma c6
50k lvl 50 kaeya c1
100k barbara lvl 50 c6
if you take into account full bursts techinically yae is on top
i havent done a damage test in ages so i wont be surprised if i can hit way higher for some of these 
plain fox
raiden did 124k
venti does 3k(ish) per tick whatever that equates to for a full burst
skill was like 40k
idk 💀
lunar cloak
243k with raiden and around 312k total of ayaka burst!
remote sable
sour vessel
sharing my no buff and no potion, raw damage of my shogun ✨
empty garden
106k with childe but it wasn't really a showcase only bennett buff 💀 idk how it happened
plain fox
sharing my no buff and no potion, raw damage of my shogun ✨
no buff
isn’t that bennetts burst 😭
rustic siren
isn’t that bennetts burst 😭
by buff i think they meant food, there's also kazuha and sara on the team
plain fox
that makes sense i suppose