Neutral:
* Outspoken: This implies someone who expresses their opinions freely and directly.
* Forthright: Similar to "outspoken," but with an added implication of honesty and directness.
* Vocal: This emphasizes the person's tendency to speak up and make their voice heard.
Negative:
* Boastful: This suggests someone who talks excessively about their accomplishments.
* Braggart: A more negative term than "boastful," implying someone who exaggerates their achievements.
* Rambling: This describes someone who speaks at length without a clear point.
* Garrulous: This refers to someone who talks excessively and often about trivial matters.
* Loquacious: Similar to "garrulous," but with a more formal tone.
* Effusive: This suggests someone who expresses their opinions with excessive enthusiasm.
Humorous:
* Chatty Cathy: This playful term suggests someone who talks a lot.
* Windbag: This humorous term is often used to describe someone who talks at length without saying anything of substance.
The best euphemism to use will depend on the specific situation and the speaker's desired tone.