March 7th is capable of doing some awesome synergies using the other Honkai: Star Rail cast members. Here are two builds together with her at the forefront.
March 7th's make of tanking is a touch different from another character in Honkai: Star Rail. Instead of directly taking in incoming damage herself, she helps them survive by providing them strong shields which draw in enemy aggro. This slight nuance does mean that players possess some niche options to select from when deciding who to pair March with.
Like additional characters hanging around, March is very versatile. She can easily fit in any team to tackle any challenge Honkai: Star Rail provides. However, she continues to have her suite of strengths, and just very specific team comps can bring out the very best in her. Here are two specialized teams revolving around March 7th.
The Clara Counter-Attack Team
Technically, this will work with any unit which has a counter-attack feature. It just so happens that Clara may be the only other character in Honkai: Star Rail 1.0 which has this mechanic.
DPS: Clara
Tank: March 7th
Healer: Natasha/Bailu
Flex slot: Sub-DPS/Support
March can boost the aggro on Clara by placing a shield on her behalf. When the latter uses her Ultimate, the probability of enemies attacking Clara greatly increases. Every time a shielded Clara is attacked, both Svarog and March will retaliate with counter-attacks. This combo is strong within the Forgotten Hall, also it can be ludicrously overpowered within the Simulated Universe where players can stack blessings from the Elation.
Have a healer prepared to help them recover from AOE attacks. In ideal scenarios, March ought to always be using her shield on Clara, meaning players won't need to bother about their favorite little sister getting hurt.
The flex slot on this team could be occupied by an ST damage dealer like Dan Heng or perhaps an offensive Support unit like Pela or Tingyun.
March 7th Permafreeze Comp
This team is going to be most effective within the Simulated Universe, although it can work elsewhere if players purchase Effect Hit Rate. With enough blessings from the Remembrance, March, and her teammates can consistently freeze enemies while simultaneously applying a lot of other powerful effects.
DPS: Any (Yanqing, preferably)
Tank: March 7th
Healer: Natasha/Bailu
Flex slot: Herta/Pela
March's Ultimate includes a 50% base opportunity to Freeze enemies automatically. This procs surprisingly often as long as enemies aren't resistant against Ice, so using a bit of extra Effect Hit Rate on her behalf Relics should make her more consistent over the battles she fights.
During Simulated Universe runs, players may wish to get as numerous Ice characters as they possibly can synergize using the Remembrance's blessings. Herta shines very best in this game mode because of her AOE Ice attacks. However, since her effectiveness falls off everywhere else, Pela should take her slot.
Additionally, players should prioritize getting blessings that increase Effect HIt Rate or have additional effects that inflict Freeze or Dissociation. Outside the Simulated Universe, this team comp will end up heavily determined by the DPS carry that players choose to bring. Yanqing may be the most ideal pick here since he's both high damages along with a base opportunity to Freeze targets.
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