Attraction
Initially, this can be complementary: The Type 2 is attracted to those with needs who will love them for their help, while the Type 6, often anxious, longs for comfort.
Type 2 admires Type 6’s modesty, playfulness, loyalty, and hardworking nature.
Type 6 is drawn to Type 2’s kindness, compassion, open-mindedness, and helpfulness.
Both are hardworking, eager to serve noble causes, quite relational, and can form a couple based on mutual respect, trust, and affection.
Potential Challenges
Type 2 may see Type 6 as overly suspicious, pessimistic, controlling, accusatory, negative, and resistant to help.
Type 6 may see Type 2 as too intrusive, manipulative, and too needy for attention and approval.
The "potential challenges" arise in an Enneagram-type couple primarily when they are not in harmony with themselves. With communication, each person's investment in the relationship, and mutual understanding, these challenges can certainly be avoided and resolved.