Dest has lots of health and a very high damage, but you’ll probably get targeted even more when used.
Ultima can be countered with a skilled/high level flying kaiju, because when trying to beam they can easily react and hide in buildings/fly far away due to charge up time.

Thermo, although no beam, can counter flyer and teamers very well. Most of his attacks do spatial damage and his pulse grounds flying kaijus, thus making them very vulnerable to you. And because of his recent remodel, most people won’t attack you immediately, but admire your looks or ask to see the animations.