Learn English – What do you call a person who takes interest in analyzing people’s handwritings

Friends may half-jokingly call that person the little dictator/tyrant. This is slang but good.

However I think the best word for your details is imperious.

assuming power or authority without justification; arrogant and domineering

Some other words to describe this person would be:

• overbearing... unpleasantly or arrogantly domineering
• to be "nice" you can say assertive... having or showing a confident and forceful personality
• usually used for a woman (by other women) would be haughty... arrogantly superior and disdainful.
• and the common man's term would be simply pushy... excessively or unpleasantly self-assertive or ambitious.

Absentminded may fit your description:

• tending to forget things or to not notice things : having or showing a lack of attention.

( M-W)