Heart radical on the left - the upright side-form of 心, and also 慎's indexing radical. Marks it as an emotional/mental state: being careful and prudent is a matter of the heart. Same radical in 怕, 怀, 情, 性.
Right side 真 supplies the sound: zhēn to shèn with regular zh-/sh- alternation. It also adds semantic flavour - being prudent is being true to careful judgement. Same phonetic in 镇 (town), 填 (fill), 颠 (top).
League of Legends champion, the Eye of Twilight. A ninja tank from the Kinkou Order whose name (慎 = careful/prudent) fits his defensive, disciplined playstyle.
