Keith is incapable of feeling like others do; nothing else matters to him except two things in life: his sister and Randy. He will do anything to protect those who give meaning to his life, but his highly volatile nature can lead him to make regrettable decisions. Despite his hatred towards both of the Wood brothers, he tries his best to tolerate their existence because Randy and his sister have a liking for them.

Keith reference* (Noctis): https://www.youtube.com/watch?v=_tg2df6D8gA 

*Note: A more nasal and high-pitched kinda voice would be very welcome.