I dunno... The Andalites arrogance seems cliche at first glance, but imagine the burden they carry and it quickly becomes apparent that its a psychological backlash.. not so cliche or simple after all....
Yeerks seem cliche, the idea of the enemy among us, but
A; theyre so well executed it makes up for this and
B; the ethical quandries battling a controller creates MORE than make up for this.
Hork-Bajir Seem a bit cliche; but their biology helps this, and theyre paired with either the main good or bad guys in most instances, so they can be forgiven as they are supporting characters....
The Taxxons were something Id never seen before, so not so cliche for me...
Visser 3 was incredibly... I hesitate to say cliche so Ill say refreshingly traditional. Classic if you will
and ya can't argue witht he classics.
And after that I cant think of anything remotely cliche....