I don't know where the suggestion thread is, if there's one, so I'll post here. I could make some suggestions, but not only offline.
* What about the recration of the tier system of Q3A? 4 new enemies for 4 new maps, and the 4th. map is a fight against some boss.
I mean, something like this:
- Tier (Step) 0: Beginning
-- Tanisha (Test match, like Q3A's Tier 0 against Crash)
- Tier (Step) 1: Learning
-- Tony, Liz, Sergei, Jenna, Kyonshi (4th. match, 1on1 against him)
- Tier (Step) 2: Spirit
-- Sarge, Major, Angelyss, Penguin, Gargoyle (4th. match, 1on1 against her)
- Tier (Step) 3: Strong Soul
-- Ayumi, Skelebot, Grunt, Beret, Merman (4th. match, 1on1 against him)
- Tier (Step) 4: Last Entrance
-- Assassin, Grism, Nekoyss, Rai, Arachna (4th. match, 1on1 against her)
- Tier (Step) 5: Eternity
- Final match against Timaster, the final boss. (I'll explain him below, don't worry

)
* New character: Timaster (for Time Master, if you want to change the name I'm not against it) would be a Nostradamus-based character, (at least in his appearance, and his skin/model could be copied/inspired/based in Kyonshi -and a bit bigger-) which could be a Time Master of the Universe, or something like that, and will be the final boss of the game. He should be as dangerous as Xaero was (or more) on Q3A.