Gorou is designed to be a support for defensive Geo characters in Genshin Impact. He can grant a large DEF, Geo DMG, and Geo Crit DMG buff to his teammates. Luckily, many Geo units can benefit from this effect. For example, Gorou is easily the best support character for Arataki Itto. Other than that, the Canine Warrior will grant a great boost if paired with Albedo or Noelle.

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When Gorou uses his Elemental Skill, he'll create an AOE field that grants DEF and Geo DMG bonus. This buff will scale with the number of Geo characters that exist in the party. Meanwhile, when he casts his Elemental Burst, his buff will follow the active character, so players don't have to worry about staying in his AOE. The buff granted by his Burst will follow the multiplier on his Skill, so his Skill has a higher priority to upgrade.

Are Gorou's Constellations Worth It?

While Gorou's Elemental Skill has a higher priority than his ultimate, Travelers will still want to use his Elemental Burst as much as possible. It will deal periodical AOE damage, and at C6, it can grant a massive buff to his teammates.

Note: The Constellation effects are taken directly from Genshin Impact, just slightly reworded in places. C3 and C5 are not included as they only upgrade Elemental Skill and Elemental Burst talent by three levels each.

C1 - Rushing Hound: Swift As The Wind

• Constellation effect: When other characters within the AOE of Gorou's Elemental Skill or Burst deal Geo DMG to opponents, the CD of Gorou's Elemental Skill is decreased by 2s. This effect can occur once every 10s.
• Importance: Skippable

This effect could be great, but unfortunately, Gorou already has a 100% uptime on his Elemental Skill. It has a 10s duration and 10s cooldown, so this effect is practically not needed.

C2 - Sitting Hound: Steady as a Clock

• Constellation effect: While Elemental Burst is in effect, its duration is extended by 1s when a nearby active character obtains an Elemental Shard from a Crystallize reaction. This effect can occur once every 0.1s. Max extension is 3s.
• Importance: Medium

Gorou's second Genshin Impact Constellation can extend his Elemental Burst duration from 9s to 12s. This is a decent addition as his Burst has better effects than his Elemental Skill. If Travelers pair Gorou with Itto, the former can buff the latter for the entirety of his Elemental Burst duration (Itto's Burst last for 11s)

C4 - Lapping Hound: Warm as Water

• Constellation effect: When Elemental Burst is in the "Impregnable" or "Crunch" states, it will also heal active characters within its AOE by 50% of Gorou's own DEF every 1.5s.
• Importance: Low

Many were excited to see that Gorou can be a healer with his C4. Unfortunately, after many theorycrafters tinker with the numbers, they all agree that his healing is way too low to be accounted for. Even when he's built to be a dedicated healer (with DEF/DEF/Healing Bonus artifact), his team recovery is still insignificant. Therefore, players should not build Gorou as a healer. It's simply not worth it.

C6 - Valiant Hound: Mountainous Fealty

• Constellation effect: For 12s after using Elemental Skill or Burst, increases the CRIT DMG of all nearby party members' Geo DMG based on the buff level. This effect cannot stack.
• Importance: Priority

Sadly, while his Constellations are mostly insignificant, Gorou's best feature lies in his final Constellation. So at the end of the day, players would want to collect seven Gorou in their playtime. With his C6, Gorou will boost the Critical DMG of Geo DMG. The level will scale with the number of Geo characters in the party.

• Standing Firm (One Geo): +10%
• Impregnable (Two Geo): +20%
• Crunch (Three Geo): +40%

C6 Gorou will be insanely good when paired with Genshin Impact's Arataki Itto. If there's another Geo unit in the team, the three of them will enjoy a massive Geo DMG addition from Gorou.

Genshin Impact is now available on Mobile, PC, PS4, and PS5. A Switch version is in development.

Source: Genshin Impact Wiki