Lucky is an Exceed who's married to Marl. He comes across as pretty gruff—loud, aggressive, and quick to throw hands (or gardening tools) at strangers. When he first met Happy, he literally started swinging at him without much hesitation.
But there's more to him than the tough-guy act. According to Marl, Lucky's actually got a good heart underneath all that bluster. She says they share the same core values, suggesting his abrasive personality masks beliefs that are actually pretty solid. He also looks older than your typical Exceed, which adds to his overall weathered, no-nonsense vibe.
Content compiled by AnimeList.moe from publicly available sources.