This generally makes for a talkative and resourceful person who is curious about everything and enjoys exploring new ideas, especially with the Aries placement His life probably revolves around communication. On the flip-side, this person may be overly self-cantered and needs to work on developing an interest in other peoples thoughts, ideas and opinions.
Here two great articles on Mercury conjunct Ascendant:
Mercury conjunct the Ascendant shows that you are intensely preoccupied with yourself. You probably start your conversation with ‘I’ more often than most people do, and the word ‘me’ crops up regularly in your dialogue. This is not such a terrible thing, but it is boring to others. Your mental faculties are well-developed, and for the most part you are bright and witty, so your incessant use of the personal pronoun must be tolerated. Intellectually enthusiastic about every bit of information you receive, you are inclined to burst out with rash statements of opinion when provoked. You pride yourself on how easy it is for you to learn, and may show disdain for anyone who has to concentrate harder.
You are mentally impulsive and rarely give anyone the chance to answer your questions. In a crowd, you can dominate the conversation by asking questions that you answer yourself or by posing problems that you immediately solve. An original and creative speaker, you often dramatize what you have to say with a display of acting ability. People are fascinated by your command of language and effective delivery. You are not afraid to speak up when you know you are right, but the fact is that you aren’t always right. When your views are criticized, you become indignant and argumentative. You are no shrinking violet, and would rather put up than shut up.
Mercury on the Ascendant shows a fondness for contacts with the outside world; also a need for continual change and give-and-take. There is great curiosity, and often this makes us early-wise. Mercury is a mobile planet and, when on the Ascendant, gives physical mobility and unrest, sometimes nerviness too, but also considerable manual dexterity. This conjunction, which generally indicates a bright mind, does not necessarily promise great learning capacity, since we find it hard to concentrate. We are at our best when free to chop and change and to do several things at the same time (although the remainder of the chart must be taken into consideration before one can hazard an opinion on the degree of changeability involved).