IDs

Character IDs

"AvatarID": 1001, - March 7th
"AvatarID": 1002, - Dan Heng
"AvatarID": 1003, - Himeko
"AvatarID": 1004, - Welt
"AvatarID": 1005, - Kafka
"AvatarID": 1006, - Bronya (Silver Wolf)
"AvatarID": 1008, - Arlan
"AvatarID": 1009, - Asta
"AvatarID": 1013, - Herta
"AvatarID": 1101, - Bronya (Adult)
"AvatarID": 1102, - Seele
"AvatarID": 1103, - Serval
"AvatarID": 1104, - Gepard
"AvatarID": 1105, - Natasha
"AvatarID": 1106, - Pela
"AvatarID": 1107, - Clara
"AvatarID": 1108, - Sampo
"AvatarID": 1109, - Hook
"AvatarID": 1203, - Luocha
"AvatarID": 1204, - Jing Yuan
"AvatarID": 1205, - Blade
"AvatarID": 1206, - Sushang

Monster IDs

Here is a list of monster IDs with images (link)

thanks to IceT#1317

Map IDs

will be added later