Archer Best Team Compositions & Character Synergies

Sparkle is the best Support Unit for Archer. Sparkle is a completely SP Positive Action Advance unit that provides powerful buffs for Archer's Turn. Sparkle also increases the Maximum Skill Point cap by 2 allowing you to use more Skills per turn and makes the team significantly more comfy to play as you have a lower chance of overcapping Skill Points if you are not planning out each turn perfectly. Sparkle also provides more ATK % to Quantum units.

Sunday is a powerful Action Advance Unit with very strong Buffs and the ability to generate Energy for Archer and is at worst SP Neutral. Sunday provides 20% CRIT Rate, significant CRIT DMG buff and 30% DMG boost in addition to the Action Advance. Sunday is usually used with Archer to add more Basic ATKs from Archer which results in you getting Sunday's powerful buffs for free while Sunday effectively works as one of the best Skill Point generating units in the game.

Cipher is a very fast Nihility unit that can generate a lot of Skill Points without costing any significant amount of DPS as her main debuffs automatically apply themselves without Cipher needing to act or use her Skill. Cipher also provides her damage boosts via increased Damage Taken on the enemies, alongside a mechanic that stores damage to later be dealt as True DMG based on what your allies dealt to the enemies prior to Cipher using her Ultimate Yours Truly, Kitty Phantom Thief! which will reset the stored amount.

Tribbie is a versatile Harmony support unit giving stats that Archer does not have: increased Damage Taken on enemies and RES PEN making her a very large Amplifier for Archer's damage. Tribbie's only downside is that she acts infrequently and has to maintain her Skill's Zone making her less effective at generating Skill Points than some other options.

Silver Wolf is a Nihility Support that has damage amplifying debuffs. Silver Wolf reduces the enemy DEF and All-Type RES by a significant amount and can implant Quantum Weakness if the enemy does not have it making Genius of Brilliant Stars better.
Silver Wolf cannot afford to spam her Skill in Archer teams due to the Skill Points being more valuable on Archer. With Before the Tutorial Mission Starts Silver Wolf can still get a 3T Ultimate with only Basic ATKs or 2T Ultimate if you alternate Skill + Basic ATK to maintain her RES Pen but this is SP Neutral instead of Positive.

Robin is a powerful Harmony Support that synergises very well with Archer. Robin provides a significant boost to DMG % and ATK, as well as a small increase to CRIT DMG.
Archer can hit multiple times per turn with his Skill and Follow-up ATKs allowing him to build energy for Robin's Ultimate quickly and proc a lot of Additional DMG from Robin's Ultimate. Additionally, the team-wide Action Advance from Robin's Ultimate allows you to generate a lot of Skill Points.

Gallagher is a 4★ Abundance Sustain Unit that Advances himself every time he uses his Ultimate. Gallagher ends up taking significantly more turns than any other Sustain unit in the game making him the best unit for generating Skill Points. Additionally, Gallagher can run the Multiplication Lightcone to make his turns even faster or the Quid Pro Quo Lightcone to generate significant energy for everyone on the team which is very powerful.