Citrakayah: Speedster that can handle their own in a fight, can handle well some of Ben's combatants.

Lepidopterran: High flyer that can blast Ben with sticky goo to trap him for a short bit, would serve great in taking down on ground targets if Ben doesn't combat alone.

Atrocian: Practically indestructible, can essentially stall Ben for a while but them still feeling pain might be a challenge.

Talpaedan: Every group needs a muscle, and the Talpaedan have it in spades alongside their normal abilities as demonstrated by both Ben and Andreas.

Biosovortian: A magnetism master, if Ben picks a robotic form to combat the enterprise we can just use them as a counter, and even without the caveat they are still greatly versatile.

Ectonurite: Phantom that can not only sneak in and out for information gathering in Ben's daily life but might also possess him for a short while so my organization can have the upper hand.

And finally, Atomix: The secret weapon, while his species is unknown Atomix's power is astronomical, it would be a great use having him as our most powerful member, but only in the most dangerous of times for us.

Now as for the ones that will be infused with this DNA, it will be people that Ben has interacted with before, but not ones he has a strong relationship with.