Team 1
Team best used against enemies with Barriers or ATK buffs, but with the help of Hugo they perform well in other scenarios as well.
Team 2
Classic Edahn's team. Yihwa needs to be the highest ATK unit.
Ice Spear Khun Aguero is there for the HP Recovery block, when that is not needed he can be removed or replaced by other units, like for example Zahard if you need a Barrier Break.
With Yihwa it's normally better to leave the slot empty unless you need it, otherwise the additional unit will just waste Yihwa's passive stacks.
Team 3
Alphine and Gustang are great together, as the utility provided by Alphine complements nicely the weaknesses of Gustang. Anaak is there to block HP Recovery on the enemies and Narae is just providing extra Energy to make the whole thing a bit smoother.
Team 4
This is a pretty classic Dowon Team. You could use Hockney instead of Xia Xia or Data Mascheny instead of Yama.
Team 5
This team is all about maintaining uptime on Evan Special Move, grouping enemies with Yirang and killing them off with Augusgus.
There is no frontline in this team, but Yirang should keep enemies at a reasonable distance and Garam helps CC them, all while providing a damage buff to Augusgus and Energy for Evan.