It's pretty simple folks. Certified NHLPA agents are all listed here: http://www.nhlpa.com/inside-nhlpa/certified-player-agents. There are tons of them affiliated with small or big agencies, some national with regional offices or even international. These agents act as "advisors" for kids going the NCAA route. These certified NHL agents are really the only "true hockey advisors" and they forego any meaningful compensation from NCAA bound families/players until a pro contract is signed when they officially become the player's agent. The USHL and College Hockey INC websites probably have additional details. Prodigies (read potential 1st round NHL picks, 100% definite NCAA caliber top line players) are courted by these agents as young as 13-14 which, while wacky, is the way it is.
Any non certified NHLPA agent who claiming to be an "advisor" is probably no different than the basketball runners who funnel kids to colleges. There are likely some payout for them (cash under the table from boosters, kids participating at their camps, etc). If your kid needs help from these advisors who are not real agents, your kid is not really on any radar other than to get in the queue for some pay-to-play league. The real agents have a pulse on the prospect pipeline and have established businesses where they take on selected clientele that have a foreseeable payout at the NHL level where they get 3-5% of pro players as a commission for services - aka they are not in the business to make $1k or $2k from signing up a kid to play Tier I/II/III U16/U18 or junior hockey.
I believe that Bobby Orr was the family advisor for Noah Hanifin and he is now his agent.
Correct re Hanifin and Orr - numerous agencies/agents were courting the family to serve as Noah's advisor until he turned pro. One of the big reasons these prodigies get advisors is to navigate the ladder until they are in the NHL. The Canadian Hockey League (CHL) is a junior league comprised of three leagues (think conferences for NCAA) - the WHL, OHL, and QMJHL. Any player signing a contract and playing in the CHL - regardless of which of the 3 leagues (which each have specific territory rights in the US) is deemed ineligible for the NCAA. So it is a pretty big decision for 15/16 year old prodigies (even though they are still kids) to decide which route - CHL or NCAA - makes the most sense. Advisors can help with this process and should the family pick the NCAA route these advisors help the family sort out where they should play until they enroll in college. If the family chooses the CHL the advisor can immediately become the player's agent and sign a formal contract. Once the NHL draft rolls around, regardless if the player is in the CHL or in the NCAA (or committed to the NCAA) the agent/advisor deals with the NHL teams on the player's behalf.