It's not an adverb at all, but an adjective! "You look cheerful!"
The adverbial form is "cheerfully", or, to be colourful, "cheerily". "He grinned cheerfully at the crowd."
Cheerfully is an adverb of manner as it tells us how the verb is done or happens.
Cheerfull.
sad, gloomy, depressed
It is time adverb
It is an adverb of degree.
Adverb of Degree
adverb of degree
There is no adverb derived from type. Not every word has a corresponding noun verb adverb adjective etc
It's an adverb of time.
Avoid is not any type of adverb because it's a verb.
to be in a very good mood, happy and optimistic
No, it is an adverb of indefinite time. This is another type of adverb of time.
Is is not an adverb it is a be verb. Be verbs are: present -- am is are past -- was were