I have several genes I'd love to see added to the mod that ideally isnt to strong, fits the mobs they are from, and stays within the realm of possibility.

1. Flight momentum control/reduction - A Mutation of the phantom's or ender dragon's flight gene. These mobs tend to be able to pivot midair very quickly and it be nice to share that ability.

2. Hoard Mentality - From zombie pigman and/or silverfish, if they player is struck while near over of these mobs, they will assist the player by attacking the attacker. If the player attacks the pigman/silverfish, the effect is nullified. I'd like to recommend making this an enhanced gene as it can be very powerful.

3. Tetrodotoxin - A simple gene to add the defensive effect where when the player is attacked, similar to thorns, it applies poison to the attacker.

3.5) Tetrodotoxin II - A mutated variant of the gene that has a higher tier of poison or also puts a very short paralysis effect on the attacker.

4. Big Nose - Allows the player to dig up seeds similar to the sniffer mob on soft blocks like grass, dirt, sand, and gravel. It also be cool to give the player the ability to use their empty hand on suspicions sand/gravel to dig the contents out without the brush.

5. Sculk's Embrace - A mutated gene of the warden that gives a few effects. Sculk no long can be triggered by players with these genes and wardens will be neutral to these players. A cool effect that be a lot harder but really cool would be if sculk around the player with this gene is triggered, the player can see the sensor through walls that was triggered.

(with the last one, it may be better to split it up into sever different genes)

I have some other ideas, however these are some of the ones i feel are best attuned for the feel of the mod.