BtVS + Love Languages: Angel
"I'll give you that view you crave, darling. I'll give you everything."
"Giles didn't set this up. Angel did. This is the wrapping for the gift."
"I found it in a quaint little shopgirl."
Angel's character journey can be tracked through gifts, and the ways in which he exchanges them. After he is turned into a vampire by Darla, the two of them spend centuries killing and torturing together; exchanging gifts. He lures her away from the Master by promising her the beautiful views and fine things she's always wanted. She returns by gifting him victims to torture. Two of his most notable crimes were committed against women that Darla found and "gifted" to him - first Drusilla, and later the Romani girl that resulted in his ensouling.
In 1996, after meeting with Whistler, he devoted himself to Buffy's cause, and he gives gifts as evidence of that devotion. His gift of the cross necklace in the pilot proves himself as an ally to her. His gift of the Claddagh ring in Surprise is meant to demonstrate his love and commitment to her. He gifts jewllery - a classic romantic trope meant to highlight the romanticism of his character.
When he loses his soul again, his romanticism turns dark, and so do his gifts. He leaves drawings and flowers for Buffy, which is equal parts intentionally mockery, and also demonstrative of his undying obsession with her. His love is twisted sideways, and so his love language. With Jenny's death, we see the apex of this drive to leave sick gifts. His love is not just for Buffy, but for death itself. Jenny is left as a gift, an offering, a tribute. A monument to death.
His growing feelings for Cordelia in late S2 are shown with the repeated gifts he brings her. Unlike the highly romanticised gifts given to Buffy, his gifts to Cordelia - buying her clothes, buying her food when she is feeling down, brainstorming future holidays with her - are more based in everyday needs, representing the more mature, down-to-earth love he shares with her.
As Angel leaves Sunnydale, his world expands beyond the handful of women he has been obsessed with. He gains friends, and a family, and he demonstrates his love for him by bringing home thoughtful gifts for each of them in Heartthrob. When he becomes a father, he does all he can to give his son a good life - and he finally achieves this by giving him up, an act which can be seen as the ultimate gift. He is a man of few words and muted expressions, but he shows his love through these gifts.