While Sean and Daisy are similar in a lot of ways, (both are welcoming, kind, friendly, absolute sweethears, etc), the difference between them is their amount of freedom, and their specific details of parent issues. While Daisy has many restrictions and deals with a ton of pressure from her moms who constantly focus on her performance too much and she feels trapped, Seans' parents are implied to pay little to no attention to the point of potential emotional neglect, in which case he has a ton of freedom, yet still suffers from lack of care he receives. However,in this position, Sean is capable of pointing Daisy to the right direction in which she can express herself more and find healthier ways to cope and relax without pressure, because Sean probably never had as much restrictions as Daisy had and had to learn to cope and find ways to enjoy life himself. I hope that in season two Daisy will be able to help Sean with HIS own situation and make him feel heard. (she isn't obliged to, I just feel like it would be nice)
Random side note but I love how more emotionally open and expressive they feel free to be around each other, it really shows their level of trust for one another. (which ties into the symbolism of blue daisies which represent deep trust, honesty and loyalty according to vvarious online articles, which IS relevant bc of Daisys' name and bc both Sean and Daisy wear blue and