There have been a number of combinations of Valorant characters to create interesting and dominating team compositions in games. One certain kind of lineup that has been catching on a bit lately on larger maps like Haven is the "no duelist" composition. This five character team does not include a duelist that would go in first or begin to engage aggressively to gain positioning for their team, but instead sacrifices that for a leg up on mid-round utility.
The "no duelist" lineup will usually play much slower on offense, but the extra utility gained will allow for a dominant and suffocating defensive side. This has been seen most often on Haven, with three bombsites to protect more utility is needed and sometimes a duelist may not have enough to protect areas on their own. Instead, a team composition will come out looking something like this:
These five agents allow for a wide arrangement of abilities and useful information gathering that make their setup on defense impenetrable when used properly. Whether it be flashing the enemy with Skye or using the arrows of Sova, any information needed to find where the enemy team is can be found, and allow the Astra, Sage, and Killjoy to set up a defense that would make any Jett quake in their boots.
Even on offense, this team could be extremely dangerous. Skye can be used as the "duelist of the team" using her dog or her flashes to entry on a site, allowing her team to plant the bomb. When this team plants the bomb, it is incredibly difficult to win the round against them, as the combination of Killjoy and Sova has so much deny ability on the defuse that the team doesn't even really need to be on the site. If they choose to be on-site, the wall and slow orbs of Sage along with the smokes of Astra make the enemy team's job entering the site near impossible as well. This team has its niche fits, and will not work on every map. However, when it does work with five players all coming together and communicating, it can be one of the most imposing five-man lineups in all of Valorant.
You may see lineups like it is currently being used in Valorant's VCT qualifiers, happening on Twitch.