GREETINGS
Thank you good sir for taking the time to look at this post.
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Ok, so here's my suggestion

*drums*

INGAME IGNORE SYSTEM!
you heard me!

How many times haven't you been wanting to shut those spammers in Quick Aikido 3 up, or the annoying sc*nts in tourneys? Well! If we just add a simple IGNORE then noooo problem



Idea 2

Improved Ranking system

It seems to me, me atleast, thats me, not you, me.. that rankings are really.. meh...
All the sudden you can get dropped from rank 5000 to 30k if you get beat by a player, also a place where you can check the online rankings would be NICE TOO.

ANOTHER ONE OMG

More advanced sound options! These hit-sounds are sometimes very agitating in the middle of a fight, and the aftermath, gurgh. A compilation of dubstep drops and rock mixes in 0,2 second sound-space while watching a replay, gooosh

Those are my suggestions