彼の性格には

in his character

→ 彼
phrase Rare #38,110
in his character A phrase fragment meaning “as for his character” or “in terms of his personality.” The に indicates the aspect or area being discussed, while は marks it as the topic.
JA: 彼の性格には、少し頑固なところがある。
EN: There is a slightly stubborn side to his personality.

彼の性格には同情心まったく欠けている

He has absolutely no compassion in his character.

彼の性格には単なる正直以上ものがある

There's more to his personality than mere honesty.

彼の性格には欠点がある

He has flaws in his personality.

彼の性格には勤勉さがない

Diligence is not part of his character.