The two young women are somewhat similar, although Hermia seems to be more determined and more of a leader and Helena more of a follower. Hermia is the slightly prettier of the two and Helena the taller. Hermia seems slightly more assertive and Helena more diffident.
The two young men, Lysander and Demetrius, also appear relatively similar, although Demetrius appears the more self-serving and fickle. He appears to behave rather cruelly to Helena and opportunistically to Hermia, and he regards love somewhat transactionally. Lysander is the more romantic of the two, genuinely besotted with Hermia.
Oberon and Titania are king and queen of the fairies. Both are magical creatures of great power, accustomed to getting their own ways. Puck is also a magical creature, mischievous and generally benevolent.
The mechanicals are comic foils, naive but serious about doing a good job with their play. Bottom is bombastic and egotistical.
Theseus is portrayed as a good leader, wise, gracious, and generous, issuing sound judgments and suggestions.