The Summoner summons minions to do his bidding.

Create decks with different characters or even same summoners in multiple decks or allow to bind F6 - F12 to different summoners

Who doesn't have more than 4 summoners they use on a map?

Imagine the time saved if you had Deck 1 bound to F6 where you have your Tower Apprentice, Fortify Squire, Aura Monk and Trap Hunter to build your map then quickly at the last moment switch to your Deck 2 bound to F7 when you'd like to have, your DPS apprentice, Block Squire Dragon, DPS Huntress, and DPS Monk. without going into character panel then swapping each and every character out.

Or switch to a deck to help powerlevel between 4 summoners under 90.

A duel-wielding Hero of pure destruction.

Just like dd1 the crystal should be customizable and lock some cool designs behind achievments and challenges and what not so other players know what you have achieved to get the cooles crystal in the game i would love to see a return of the Trendy Ent crystal but also a new Chromatic Games crystal

Not having ogres or any specific mob being announced or pinged when it spawns makes survival rounds a little unpredictable, or makes the players not know why they lost.

Having a DD1-ish way of announcing certain enemies would be useful. And it's the best of both worlds if it's togglable.

Allow options like default, strong, flying, close, and first (by distance to core), this would work as a first target basis, e.g. flying - target flying first once dead goes back to default targetting.

In DD1 you could press a key to rotate through towers that were stacked (like auras and traps) that were placed in the same position. DDA would most likely benefit from this feature similarly to prevent the hassle of looking upwards to edit auras, or placing towers separately.

It would be awesome to sell, browse through inventory during waves, nothing on the "equipped" category, such as equip another set, maybe 'lock' the equipped items

Make the grind more fun!

In Dungeon Defenders 1 there was a QoL update very late in the Game that added the ability to force start the wave as the host using Ctrl + G please get this back to us as fast as possible :)

Leader Enemies can spawn in every enemie class and will will be bigger and have most likely more health than the normal enemies ontop of that they could get a unique skin and should get atleast 1 new attack or boost other enemies in the same class in some way that are close to them for example

-Goblin Leaders can increase the max damage of goblins nearby and have higher priority on the towers so they get the most damage before the goblins around him get targeted -Dark Elf Archer Leaders should have increased range and shoot multiple arrows with increased damage and target multiple defenses at once with like a 3 shot attack -Kobold Leaders should spawn with multiple kobolds around him that try to protect him because when he explodes near defenses he will do a big explosion and hit hard -Dark Elf Mage Leaders will have a constant healing aura for skeletons around him and is summoning them non stop -Dark Elf Warrior Leaders spawn with a set of thier own warriors that all stay together have a low tower prority and go for the players in the game with increased health and damage -Wyvern Leaders will be very big and speed up the other wyverns while staying infront of them and protect them that all of them can reach the defenses and crystals -Orc Leaders should be more tanky and be slower but increase the walking and attack speed of other orcs nearby and they themselves should stay back and throw thier own axe like a boomerang and it comes back to them -Skelton Leaders should be immortal until thier dark elf summoner dies and can not be damaged because they are literally dead -Ogre Leaders should ignore players completly and go straight to the crystal and do increased damage to defenses in the way but because you can't get thier attention and they are bigger and fatter ;) they move slower -Spider Leaders spawn in doors and spawn thier alot of thier own small spider workers that have increased damage and will try to web all defenses in the lane of the spider leader -Djinn Leaders have thier own smaller djinns and work together to sell defenses faster or give other enemies a faster boost or even boost multiple enemies at the same time that are in the area -Shark Leaders should be very tanky increase the speed of thier sharks around them and give them more or even infinte stamina so they don't need to stop and breath for a second -Goblin Copter Leaders should bring in multiple ogres at once instead of only one and can shoot more homing rockets and have a low priority for towers because they also don't target towers -Siren Queens should atleast target 1 player and kill him before she starts to go away this will ofc be very hard if hardcore is active also she should be activly moving and even trying to aviod being hit but also should be targetable by towers

this all is of course subject to change and just some ideas to increase the difficulty in other ways than just increase the health of all enemies and make tower weaker and will make the gameplay more dynamic and interesting

Would be great to press TAB to see the level of any defense

Option to repair all towers,auras, traps at the end of a wave on survival mode! Modes that u have infinity time between waves