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During any type of combat inHonkai: Star Rail, you can use up to four characters in a team while having up to five enemies against you at a time. However, if you want to defeat enemies in various endgame modes, you need to have good synergy between each team member.
Your team usually consists of a main DPS like Mydei, who is a five-star Imaginary Destruction character, alongside support units that can bring the best out of him. The overall damage you get from Mydei can be highly affected by the team members you use.

Luocha
Healer
If you want to get the highest possible value from Mydei, you’llhave to use him alongside three other limited five-star characters. When you first get 100 Charge on Mydei, he enters a Vendetta state, in which, he automatically attacks the target with his skill when he gets a turn.
Once Mydei enters the Vendetta state in combat, hedoesn’t go out of it unless you take a fatal blow more than three times. Moreover, he doesn’t consume any Skill Points while using his Skill automatically. When you get enough Charge during the Vendetta state, he can activate a buffed attack that deals even more damage.

you’re able to change theprimary target of the buffed attack with your Ultimateas the attack will be used on your Ultimate’s main target.
Since Mydei is essentially a Skill-Point-neutral character, you can usecharacters like Sundaywith him, who can constantly advance his turn to give him extra attacks. However, when you use these two characters together,you’ll have to tune Mydei’s SPD so that he goes just before Sundayand can get double attacks.
Furthermore, Tribbie can give him All-Type RES PEN and DMG increase while also dealing a bunch of damage herself. Tribbie’s damage also scales on her HP,which gets increased based on the team’s HP in her Ultimate, making her a perfect fit for Mydei since he will easily have over 8,000 HP.
Mydei already has a 56 percent Crit Rate with his base kit and the best relic set, andSunday gives him another 20 percent.
Having a 76 percent Crit Rate at all times in the battlemakes it a lot easier to get high Crit DMGon him with relics.
Finally, Luocha is the best sustainer for Mydei since he can regenerate all allies' HP when theyattack an enemy within his field, which largely has a 100 percent uptime. This will help Mydei overcome the HP consumption from his attacks while also helping him get Charge faster.
Gallagher
Thankfully, Mydei is one of the few characters thatdoesn’t see a massive damage drop between his best and F2P teams. This is mainly because of the overpowered kit given to Remembrance Trailblazer that can not only advance his movement once in a while but also deal extra True DMG based on his damage.
If you’ve been playing Honkai: Star Rail for a while, even as an F2P player, there’s ahigh chance that you already have Bronya as she’s a Standard character. If you do, then she’s a great character for Mydei in this team since she can constantly advance his movement while giving him a Crit DMG bonus.
In case you don’t have Bronya on your account, youcan also go with Pela for an AoE DEF-shred.
Once again,Gallagher serves the purposeof keeping Mydei alive in this team as he canheal any character that attacks the enemies with his Besotted debuff. He can also reduce the enemy’s ATK, which will prevent Mydei from taking a fatal blow in a lot of scenarios.
However, if you’re confident that you can keep Mydei alive, you can also go forLynx as the healer since she can increase his HP. Lynx also increases the chances of him getting attacked but he has the enemies taunted most of the time, making this not-so-useful.