How to deal with Tim

Question

My friend Tim is a real dick. Whatever happens to him he just won't die! I asked him what the secret to his power was (So I could kick his ass). He handed me a crumpled up piece of this paper with some numbers on it, gave me a wedgie and walked off.

The numbers are:

1 , 10 , 6 , 3 , 15
1 , 4 , 5 , 1 , 3
3 , 1.5 , 0.5 , 7.5 , 5

What can I do (If anything) to beat him?

Hint 1:

These are 3 individual sets of numbers that may not be in order

Hint 2:

Each sequence gives a different part of the answer

Hint 3:

Two of the sequences are similar

Hint 4:

An optional sequence to also consider is 2, 0.5, 0.5, 1.5, 2.5

Answer 1

Going off @Bálint Budavölgyi's comment, I think the answer might be:

The Deathly Hallows, from Harry Potter

My reasoning is:

As Hint 1 says, the numbers in each list are not in order, so we must reorder them first.
The first line can be reordered as 1, 3, 6, 10, 15...; this has already been solved and verified as the start of the sequence of triangular numbers.
The second line can be reordered as 3, 1, 4, 1, 5...; this has already been solved and verified as the first digits of pi, the circle constant.
The third line (now updated) can be reordered as 0.5, 1.5, 3, 5, 7.5...; this sequence is the same as the first, but halved. (1/2, 3/2, 6/2, 10/2, 15/2...) This is why Hint 3 suggests that two of the sequences are similar.
Hint 4 suggests that the third sequence could also be 2, 0.5, 0.5, 1.5, 2.5. This can be reordered as 1.5, 0.5, 2, 0.5, 2.5...;, which is the same as the second sequence but halved.

These sequences clue towards:

the triangle, the circle, and then dividing one or both of those shapes in half.
Combining and overlapping these images gives the symbol for the Deathly Hallows, a collection of powerful artifacts in the Harry Potter universe said to have been created by Death.
"According to legend, he who possesses these three artefacts would become the Master of Death," which would explain why we can't kill Tim.
(In reference to Hint 2, the three aspects of the image each represent one of the artefacts. Specifically, the triangle represents the Cloak of Invisibility; the circle represents the Resurrection Stone; and the line that divides the image in half represents the Elder Wand.)

Answer 2

the first line is:

Triangular Number Sequence -> 1, 3, 6, 10, 15, 21, 28, 36, 45, ... (https://www.mathsisfun.com/algebra/triangular-numbers.html)

Answer 3

The second line is

9, because the numbers can be rearranged to get $3, 1, 4, 1, 5, \_$, which are the first digits of $\pi$.

Answer 4

(Partial answer)

The first line could be:

$21$, because

If you sort the numbers ascending, you get $1, 3, 6, 10, 15$.
Then if you subsctract the previous number from the actual, add it to the actual, and then add +1 you get the next number.

$x_n = x_{n-1} + (x_{n-1} - x_{n-2}) + 1$

$15 + (15 - 10) + 1 = 21$

It is definitely a stretch, but the second line could be:

$8$, as

You sort the numbers ascending again

$1, 1, 3, 4, 5$

$x_n = x_{n-1} + x_{n-3}$

$5 + 3 = 8$

And I have a feeling that

If you add up the answers of the three individual rows, you will get: 42