Well i was just killing some time and i decided to find the average level of all my characters.
I have every single of them, 36 till now.
I did the sum of their levels and is 1816, which gives me an average of 50,444.
Just for the fun of this, what is yours?
I’m assuming you mean fifty-point-four-four-four. I know some countries use a comma where the western world uses a decimal point (.) so it LOOKS like you’re writing fifty thousand four hundred and forty four to a lot of us. 
Maybe to make it more indicative of the roster strenghth u should limit the average to the 10 or 15 first chars..
Anyway.. My first 10 116.. Overall 69,72..
19.09 for all.
25.06 for my first 15.
58.4 for first 10
41.34 for total out of 23
93.6 for my first 10
54.9 for my whole roster of 30.
Apparently that says to me I have a lot of garbage in my roster.
94.1 for top 10
46.8 for rooster
1 mio ISO spent, to add another fun fact 
it’s not really a western world thing…just a english-speaking country thing…mot of europe use the comma
anyway, on topic
Top 10 is 97.88
Everybody (36) is 49.78
82.90 for top 10
45.68 for whole roster (31 characters)
and
52.76 for whole roster, not including 5 unleveled characters. Those 1s and 6s actually make a difference.
top 10 average 67
top 15 avg. 62.07
top 20 avg. 57.7
top 25 avg. 53.8
top 30 avg. 49.97
all 32 average 47.22
no. 1 is 80
no. 31..32 are 6
36 characters, 1163 levels, 32.3 avg
Top 10, 639 levels, 63.9 avg
Top 15, 804 levels, 53.6 avg
Top 10: 948 levels, 94.8 average
Overall: 36 characters, 2024 levels, 56.2 average
Top 10: 73.5 average
Overall (33): 1128 levels, 33.18 average
Top 10 93.5
1701 levels total, 37 characters - avg level 45.97
I have 7 characters under level 10 bringing down my average
Top 10: average 108.5
Total: 1782 levels, 37 characters = 48.16 average
Thanx everybody for your responses.
This is a simple method that i use, i do thisa calculation every month to see if the average is falling due to the weekly (almost) release of new characters. If the game becomes overhelming with heroes. And it seems it does, in a slow rate, i fall each month about 1-2 %.
On the other hand one of my favourite aspects of the game is thew releasing of new characters. The expectation of what is next to come.
Thanx again.
top10: exactly 90
all (I own all characters): 51.3(8)
other statistics:
all levels in game: 3811
levels I’m able to achieve (have enough covers): 2684
levels achieved: 1850
levels to achieve: less than 2000
all covers in game: 441
covers achieved: 357
covers to achieve: 84
characters maxed: 11
characters with max covers: 20
Top 10: 97 avg.
32 man Roster:
1800 total, avg.: 56.25
84.6 for my first 10.