Present and past simple
Simple verb forms are the most common way to describe characteristic behavior. They are often used with adverbs of frequency.
Present continuous
We use continuous verb forms to describe characteristic behavior when it is part of a new trend.
We can use the adverbs of frequency always and forever with the present continuous to criticize someone's characteristic behavior.
Used + infinitive
We use used + infinitive to talk about characteristic behavior in the past.
Will and would
We use will and would to talk about characteristic behavior in the present and in the past.
Keep
We use keep followed by the -ing form of the verb to talk about (and criticize) habitual behavior.
Expressions
Tend + infinitive, be (un)likely + infinitive
We use tend + infinitive and be (un)likely + infinitive to talk about what is frequently true, and therefore characteristic, about a person's behavior.
Be in the habit of + -ing
We use be in the habit of + -ing to talk about characteristic behavior.