I will expound on the examples you provided and then give a few more of my own.
forward: Forwardness is not usually considered a positive attribute, as someone who is [too] forward unduly volunteers their opinion or views in a rather annoying manner.
straightforward: A straightfoward person does and says the right thing, regardless of the consequences. Straightforward fellows are usually considered thoughtful (and simple-minded, perhaps), but not rash and stupid.
forthcoming: The adjective, forthcoming is used to describe persons who willingly provide information. It is not necessarily a positive attribute, and it is sometimes associated with disloyalty.
frank: A frank person calls a spade a spade. If especially harsh, such a person could be described as brutally frank.
Of the four words above, I would say forthcoming does not quite belong in the group, as it more concerned with answers than opinions. Similar adjectives that come to mind are:
candid: A candid person speaks the truth in plain terms. This a neutral-positive attribute.
outspoken: This is usually a positive attribute. An outspoken person may speak out in defense of the voiceless or the oppressed and against evil. Such a person may also be a devil's advocate or a rabble-rouser. In these cases, outspokenness may be regarded as highly undesirable.
blunt: A blunt individual speaks the truth without fear or favor. One usually hears the phrase, to put it bluntly. Someone who is not as blunt may opt to put it mildly, instead. Indeed, bluntly-expressed thoughts are usually unpleasant, but they tend to be spoken from the mouth of a disciplined, upright or oppressed individual.
forthright: Forthrightness is a highly desirable quality. It applies not only to expressed opinions but also to actions and attitudes. A forthright person is honest and straightforward in his or her dealings.
vituperative: While a vituperative person may speak the truth, their ultimate goal is to spite or to scorn. This is definitely a negative attribute. There are many other related v-words, such as venomous, vicious, vindictive, etc, but these have broader meanings that go beyond the mere expression of opinion.
Hoarse typically indicates something has changed temporarily in the timbre of the voice. This could be caused by an inflammation of the vocal chords (laryngitis) which can be cause by a cold, or over-stressing the voice (yelling), acid-reflux, among other things.
While husky can apply to both men and women, it is mostly used to describe women with low-pitched voices, often, but not always, gravelly. Kathleen Turner, Stevie Nicks, or Melissa Etheridge come to mind.
Raspy voices are the opposite of smooth. Where Sinatra or Nat King Cole had silky smooth voices, Ray Charles, or Eric Burden have gravelly, gritty voices. (I can give more contemporary examples if needed)
Hoarse is the best one to use when describing the condition to a doctor. Another common phrase is "lost my voice", often an extreme example of being hoarse, where almost no sound is produced.
Best Answer
Renaissance is usually talked about in relation with the Renaissance Period. Though it may be used in this sense, I guess, but I am not sure if it is advisable.
Polymath is adequate. But please note that it usually implies that a person is an expert in several different subjects, you cannot become a polymath if you only know many subjects. Also, polymath is also used for someone who is very knowledgeable, which in this case is also applicable, so another +1 for Polymath.
Versatile is defined as begin capable of or adapted for turning easily from one to another of various tasks, fields of endeavor etc. So basically it means a person who is adaptable, can easily do tasks of a different nature. It may be used in this case, but note it, by using it you will be praising the adaptability of the person instead of his knowledge.
Aficionado is someone who is very knowledgeable and an expert in a subject. But in this case you are only referring to the person's expertise in one subject. It isn't usually used when talking about a person's skills in many subjects, which is the case.