If you are having any trouble finding the locations of these character tokens, you can use a map of the HUB, found here.

Percy Weasley
Location:
Campsite
Cost:
30,000
Abilities:
None
How to get:
On the left side of this area, there is a small pond. Around the edge of the pond, there are three green frogs. Hit all three with a spell and they will jump into the pond. When all three are in, the token will appear.

Sirius Black
Location:
Kreacher Discomforts (Level)
Cost:
10,000
Abilities:
Animagus
How to get:
In the room with the Black family tree tapestry, there is a green tank on the left. Use Aguamenti to fill the tank with water and the token will pop out.

Sirius (Azkaban)
Location:
Knockturn Alley
Cost:
250,000
Abilities:
Animagus
How to get:
Near the entrance to Borgin & Burkes, there is a cage of lobsters on the right side of the door. Behind that cage is an out-of-sight niche that you can go into, to find the token.

Nymphadora Tonks
Location:
Quidditch Pitch
Cost:
1,250,000
Abilities:
None
How to get:
As you fly around the pitch, you will see many studs and a few tokens lying around. You must grab the token as you fly by or you will need to repeat the flight again.

Tonks (Pink Coat)
Location:
A Not So Merry Christmas
Cost:
125,000
Abilities:
None
How to get:
When you are in the Weasley’s field, after leaving the garden. Head all the way to the right and you will see a half buried box. Dig it out to get the token from inside the box.

Dedalus Diggle
Location:
Grand Staircase
Cost:
20,000
Abilities:
None
How to get:
Go to the very top of the stairs, (you will need Aguamenti to get up the last set of stairs), and jump on the spider webs to reach the token above the third one.

Hestia Jones
Location:
Leaky Cauldron
Cost:
20,000
Abilities:
None
How to get:
In front of the bar there are a couple of stools. Stand on one and hit it with a spell. This will launch you into the air and show you a token hidden on the ceiling. Use the stools to launch you up so you can grab the token.

Kingsley Shacklebolt
Location:
The Flaw In The Plan (Level)
Cost:
20,000
Abilities:
None
How to get:
There are five small fires that you must put out using Aguamenti, throughout this level. The first three are in the first area that you start in. The last two are in the final area, where Harry and Voldermort are fighting.

Mundungus Fletcher
Location:
Diagon Alley
Cost:
80,000
Abilities:
None
How to get:
There is a small table outside a shop, (Florean Fortesque’s Ice Cream Parlour), with some items on it. Hit the table to knock the stuff off and you will get the token.

Ollivander
Location:
DOBBY! (Level)
Cost:
60,000
Abilities:
None
How to get:
In the basement of Malfoy Manor, walk towards the screen and you will find a trench. Drop down into the trench and head towards the middle of it. here you will find a chest with vines around it. Use Lumos to remove the vines and get the token.

Emmeline Vance
Location:
A Giant Virtuoso (Level)
Cost:
30,000
Abilities:
None
How to get:
When you reach the forest, head all the way to the right, until you find a Weasley box. On the wall behind the Weasley box, there are five large flowers that you can grow using Aguamenti. When you have done this, destroy all five flowers with a spell to reveal the token.

Cornelius Fudge
Location:
Herbology Courtyard
Cost:
200,000
Abilities:
None
How to get:
To the right of the entrance to the greenhouse, there is a patch of dried plants. Use Aguamenti to water the plant, then target the large blue flower that grows from it, with a spell. When you have cut the blue flower down, the token will appear.

Fudge (Wizengamot)
Location:
A Veiled Threat (level)
Cost:
200,000
Abilities:
None
How to get:
At the end of this level, when you are fighting Voldermort, you can see the token lying on the floor to the right of the fountain. When you have gotten rid of the fire dragon, you are then free to go and pick it up.

Dirk Cresswell
Location:
7th Corridor
Cost:
10,000
Abilities:
None
How to get:
Open the rune cabinet on the right side of the corridor.

Gregorovitch
Location:
Diagon Alley
Cost:
750,000
Abilities:
None
How to get:
Next to the exit that leads to Knockturn Alley, you will find Mr Ollivanders wand shop. There are some vines sticking out through a grate below the window. Have one of your characters use Lumos on the vines, which will cause them to pop out below the other window. Switch to another character and get them to use Lumos on these ones. If you are quick enough, (which isn’t too hard), neither window will get the vines and the token will appear.

Mafalda Hopkirk
Location:
London Street
Cost:
60,000
Abilities:
None
How to get:
On the right side of this area, near the skip, there is an image of a lego head on the wall. Use Aguamenti to wash the image off the wall and reveal the token.

Reg Cattermole
Location:
Campsite
Cost:
60,000
Abilities:
None
How to get:
On the left side of this area, near the back, there is a dried out plant on the floor. Use Aguamenti to make the flowers grow, then hit them repeatedly with spells to get rid of them all. When they are all gone, including the large one, you will get the token.

Mary Cattermole
Location:
London Street
Cost:
10,000
Abilities:
None
How to get:
On the right side of this area, near the skip, there is an image of a lego brick on the wall. Use Aguamenti to wash the image off the wall and reveal the token.

Ministry Guard
Location:
London Street
Cost:
10,000
Abilities:
None
How to get:
Use a key character to open the safe.

Madam Malkin
Location:
Madam Malkin’s Robes
Cost:
30,000
Abilities:
None
How to get:
Inside the robe shop, where you buy characters from, there are a few racks of cloths on display. Hit the one nearest to the stairs to reveal the token.

Madam Rosmerta
Location:
Just Desserts (Level)
Cost:
50,000
Abilities:
None
How to get:
Head upstairs inside the Three Broomsticks pub, and you will see a door to the right. Use dark magic to open the door and go through it. In here there is a sofa against the back wall. Jump on the sofa and you will find the token near the roof.

Ernie Prang
Location:
Grand Staircase
Cost:
100,000
Abilities:
None
How to get:
Open the run cabinet on the stairs, just above Dumbledore’s office.

Ernie Prang
Location:
Knockturn Alley
Cost:
30,000
Abilities:
Dark Magic
How to get:
Use dark magic on the pipe near the exit, then use magic on it to turn it toward the drain below it.

Regulus Black
Location:
Grand Staircase
Cost:
1,000,000
Abilities:
None
How to get:
Head up the stairs until you are outside Dumbledore’s office. Either side of the gargoyle, there are two pillars. Hit the one on the left with a spell and it will ignite. Use Aguamenti to put the flame out and you will get the token.