This is a fixed-fire style, so it tends to combine enthusiasm with staying power. Once an opinion feels true, it may be defended with conviction. That can be useful when a project needs a confident voice, a presentation needs shape, or a group needs someone willing to name the central idea. It can also make changing course feel like losing face, especially when a correction arrives in public.
The pace is not necessarily fast. Leo often wants time to frame the message properly, then deliver it with impact. Decisions may be guided by pride, loyalty, generosity, and the question, “What kind of person am I being here?” The strength is wholehearted communication; the blind spot is treating every disagreement as a judgment of character.
During a transit, this tone colors the collective conversation for a limited period. It can favor creative pitches, celebration, teaching, storytelling, performance, and direct declarations of affection. It does not mean every person suddenly communicates identically, nor does it replace the rest of a birth chart. Natal Mercury, the houses activated by the transit, and contacts to personal planets determine where the emphasis lands for you. For background, compare the Mercury encyclopedia with the Leo guide.