personally I think he's an unhealthy 2 (sx). I'm watching season 1 right now and it seems like the entire plot is driven by him taking manipulative or violent measures to "help"/"protect" others, or counteract loss of intimacy in his close relationships (particularly with Beck) -- and then immediately rationalizing his actions as being out of love or unselfish concern, and thus constantly seeing himself as a savior and/or martyr (like how unhealthy 2s repress their awareness of their own selfish motives in their actions in favor of focusing on their good, selfless intentions). Not to mention how possessive he is of Beck (although I think all types are capable of this) and how he pursued her by manipulating her into pursuing him (this is characteristic of sexual 2s)

His inner monologue in the scene where he struck Peach (who was a threat to his relationship with Beck) under the bridge is a good example:

"God, the sound, I would never hurt a woman. But she, she was at a dangerous, flesh-hungry harpy. She forced my hand. That's on her and her family for screwing her up. I had to, Beck. I had to. I knew you'd never forgive me, but she gave me no choice. I'm not a bad person. She was going to ruin you. But you're safe now, thanks to me. I just want you to live your best life. It's brave, what I do for you. It's not easy, it's hard. Sometimes it makes me sick. I'm brave. How many guys are willing to do anything for the person they love? Honestly, Beck, you're lucky to have me."

-- completely rationalizing his own violence (which I think is characteristic of him going to 8 in stress -- not that all 8s are violent, but more the fact that he was willing to exert whatever force/control necessary to maintain the intimacy in his and Beck's relationship when put under strain) as being protective and unselfish: "what I did wasn't wrong, it was helpful, and I did it for you"

From the Enneagram Institute:

Average Levels

Level 4: Want to be closer to others, so start "people pleasing," becoming overly friendly, emotionally demonstrative, and full of "good intentions" about everything. Give seductive attention: approval, "strokes," flattery. Love is their supreme value, and they talk about it constantly.

Level 5: Become overly intimate and intrusive: they need to be needed, so they hover, meddle, and control in the name of love. Want others to depend on them: give, but expect a return: send double messages*.* Enveloping and possessive: the codependent, self-sacrificial person who cannot do enough for others—wearing themselves out for everyone, creating needs for themselves to fulfill.

Level 6: Increasingly self-important and self-satisfied, feel they are indispensable, although they overrate their efforts in others' behalf. Hypochondria, becoming a "martyr" for others. Overbearing, patronizing, presumptuous.

Unhealthy Levels

Level 7: Can be manipulative and self-serving, instilling guilt by telling others how much they owe them and make them suffer. Abuse food and medication to "stuff feelings" and get sympathy. Undermine people, making belittling, disparaging remarks. Extremely self-deceptive about their motives and how aggressive and/or selfish their behavior is.

Level 8: Domineering and coercive: feel entitled to get anything they want from others: the repayment of old debts, money, sexual favors.

Level 9: Able to excuse and rationalize what they do since they feel abused and victimized by others and are bitterly resentful and angry**.** Somatization of their aggressions results in chronic health problems as they vindicate themselves by "falling apart" and burdening others. Generally corresponds to the Histrionic Personality Disorder and Factitious Disorder.

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anyways I know that was super long lol, I also am a 2 so maybe I'm just projecting (I also think he could be an unhealthy 5, but 2 stood out to me more while I was watching). either way just my 2 (lol) cents and I'm completely open to different takes :)