Saint Therese of the Chiild Jesus and Saint Catherine of Siena are my two “favorite saints”. I’m not exactly sure why they are my two main heavenly friends. They just are. Both are doctors of the church. Both lived very holy lives close to God and striving for holiness from their earliest years. I ask for their intercession the most and try to keep them in mind and the examples of their lives before me. They are my mentors and helpers, which I am ever in great need of for various things such as continuing in faith, growing in confidence, and kindling some zeal to know, love, and serve God.
(My apologies to the OP if I exceeded the designated parameters. )